NEW PRODUCTS FOR ANALYSTS &
CUSTOM-ENGINEERED ASSEMBLIES A N D COMPONENTS FOR SMALL-SCALE LABORATORY WORK NEW ASSEMBLIES MORE COMPONENTS GREATER VERSATILITY INTERCHANGEABLE PARTS
SAVE T I M E - M A T E R I A L S - M O N E Y WITH " M I N I - L A B " , N O W AVAILABLE WITH ¥ 14/20
JOINTS
A
Illustrated are a few of the many assemblies and components listed in the new " M i n i - L a b " B r o c h u r e — w e w i l l be p l e a s e d to send y o u r copy immediately upon request.
Power Supplies
Write Dep't ML-G. "Mini-Lab" is still available with % 14/35 joint for those who have been using and prefer it.
Sales and Service Division, 6 3 9 - 4 1 S. Hancock St. Louisville, Ky.
ACE GLASS V IRELAND-
INCORPORATED NEW JERSEY
For further information, circle number 50 A on Readers' Service Card, page 47 A
50 A
For ease in servicing and repair, the Atomcounter is of unitized construction. T h e complete self-contained unit, consisting of a spectrometer, a dual source, and t h e detection, integration, and d a t a presentation circuits, is housed in a metal cabinet measuring 8 1 1 / i X 43Vi inches. T h e spectrometer unit consists of a W a d s w o r t h 1.5-meter stigmatic concave grating m o u n t , with a 30,000-line per inch ruling giving 5.3 A . / m m . and good intensity over a range of 2300 to 4300 A. T w o collimating mirrors are utilized to produce two identical spectra, one above t h e other, each a t full intensity. This feature is said to m a k e it possible t o measure t w o lines v e r y close together, one in t h e lower spectrum and the other in t h e upper. I t also provides double t h e normal space for mounting photomultipliers and m a k e s it possible to employ photomultipliers directly behind almost all lines, without the need for one or more mirrors for each channel to deflect light onto the appropriate photomultiplier. 2
T h r e e new power supplies h a v e been brought out b y J o h n Fluke Mfg. Co., Inc. Model 301B is a calibrated d.c. supply capable of delivering 0.5 ampere a t any voltage from 5 t o 815 volts. Model 300R is a calibrated d.c. supply delivering 0.3 ampere at o u t p u t s from 0 to 1514 volts. F o r b o t h these supplies, resolution is 2 m v . a t any o u t p u t voltage. Regulation of b o t h is 0.002% for 20% change in line voltage and 0.002% for load current change from n o t o full For further information, see coupon on page 47 A ANALYTICAL
CHEMISTRY
load. Long term stability is 0.01% or better. Model 402 is a d.c. supply with out put of 500 to 1600 volts at 1 ma. It fea tures selective grounding, calibrated voltage controls accurate to 2% or bet ter, and choice of output connectors. Regulation is 0.03% or better for 20% change in line voltage and 0.03% for load current change from no to full load. Noise and ripple are less than 20 mv. Stability is claimed to be 0.01% short term, 0.1% long term. 3
Humidify Cabinets Cabinets that provide relative humiditj' controllable at any point from 50 to 99% ± 2%, and a dry bulb tem perature range from ambient to 70° C. ± 1° C., are offered by Blue M Electric Co. The units' counterflow air baffle and cooling coil *4JS?w^ arrangement is s- 1Ι1111ΐΐΐΐί-τΕ* said by the com pany to allow high humidity without condensation on test specimens. Extended surface cooling coil and solenoid valve is standard equipment for circulation of tap water. The design allows automatic operation at ambient, slightly below ambient, and up to 70° C. Amount of water circulation is less than 5 gallons per day. A power selector switch on the dry bulb heater permits selection of wattage in relation to temperature and work load. A low velocity, multiblade blower mounted on top of the cabinet main tains uniform vertical air flow. The cab inets are of stainless steel construction inside and out, and have an inner glass observation door, an automatic constant water level feeder, and wet and dry thermometers with wick and water box. They are manufactured in 4 sizes with capacities from 1.4 to 10.0 cubic feet. 4
Wkr
THE WARREN
SPECTHHCOHD ultraviolet
· visible
BELONGS First First First
First
·
near-infrared
IN YOUR
LAB
Practical automatic spectrophotometer recorder . . . geared to meet the faster, more competitive tempo of today's costs-and-rcsults conscious management. To combine speed with precision and accuracy . . . a new revolutionary concept of spectroscopy in a com pact, convenient instrument. Recording spectrophotometer based on daily experi ence with the needs of a major industrial laboratory . . . where savings of time and equipment were needed to extend professional skills and expand the research program. Fully field tested spectrophotometer . . . with speed and sensitivity to increase today's production . . . with flexibility to expand tomorrow's research horizons.
Power Supplies A high voltage supply, Model 312, claimed to have a high degree of regu lation and stability is now in production at Atomic Instrument Co. Designed primarily for scintillation counters, it may also be used for other counting purposes. According to the manu facturer, it permits successive experi ments to be conducted without making corrections in settings or applying correc tive factors. The Model 312 is a 60-cycle a.c,
NEW 12-page illustrated booklet explains in detail how the W a r r e n Spectracord accomplishes all these firsts . . . how it can advance your re search or process control p r o g r a m . W r i t e today for booklet 3 0 1 .
WARREN
Electronics
B O U N D
For further information, see coupon on page 47 A VOLUME 2 6, NO. 11, N O V E M B E R
-.BROOK
·
Inc..
N E W - J E R S E Y
Far further information, circle number 51 A on Readers' Service Card, page 47 A
1954
51 A
NEW PRODUCTS transformer type supply. Range of output is variable from less than 200 volts to greater than 1400 volts in 17 steps. Maximum current output is rated at 1 ma. The unit is reported to be stable to approximately 0.02% per day. Line regulation is 0.01% for a line change from 100 to 130 volts. 5 Balance Mettler Instrument Corp. is market ing a balance, Type K-5, for general use in weighing objects of from 0 to 2000
grams. It has a scale with divisions of 1 gram which can be read with an accu racy of ± 0 . 2 gram. The balance pan is placed on top of the balance so that it is unobstructed. Magnetic damping of the beam makes it possible to read the weight of an object within 2 or 3 seconds after it has been placed on the pan, according to Mettler. Power Supplies A voltage regulated power supply featuring a continuously variable 0-
to 50-volt d.c, 2-ampere output is being produced by Kepco Laboratories. In the range from 0 to 50 volts, the output voltage variation is less than 5 mv. for line fluctuations from 105 to 125 volts and less than 5 mv. for load variations from 0 to 2 amperes. Ripple voltage is less than 1 mv. A 10-turn p o t e n t i o m e t e r c o a r s e voltage control varies the voltage from 0 to 50 volts. A 3-turn potentiometer fine voltage control varies voltage within 5 volts. 7 Centrifuge
ΊορReasonswhy TYGON is f l e x i b l e
ΤYGON
TYGON is g l a s s c l e a r
is the preferred tubing for
TYGON is n o n - t o x i c TYGON is m i r r o r - s m o o t h TYGON is n o n - c o n t a m i n a t i n g TYGON is n o n - k i n k i n g
LABORATORY USE THE WORLD OVER
TYGON is n o n - c o l l a p s i b l e TYGON is i n e r t
Latest addition to International Equipment Co.'s line of laboratory cen trifuges is Model U, which is designed with a cabinet matching standard lab oratory furniture. A stainless steel auxiliary top can be used as extra bench space when the centrifuge is not in use. The equipment features a stainless steel guard bowl interior, a built-in electric tachometer, and an electric time clock. Its guard bowl ventilating sys tem has dual air filters. A vibration dampening system provides smooth operation. Available are 84 inter changeable accessory combinations. 8 Recording Spectrophotometer A new Cary recording spectropho tometer with wave-length range ex tended to include near-infrared is being manufactured by Applied Physics Corp. Model 14 incorporates a double monochromator and flicker beam photomet ric system. It automatically records absorption spectra in the wave-length region of 2000 A. to 2.6 microns.
TYGON is i m p e r m e a b l e TYGON is n o n - o x i d i z i n g TYGON is s t e r i l i z a b l e TYGON is a v a i l a b l e i n a r a n g e of s i z e s from 1 / 1 6 " ID to 2 " I D Ask for—insist
on—TYGON I t ' s branded
AT YOUR LABORATORY SUPPLY DEALER
for
your
protection
gjg-g
U. S. STONEWARE CO. Plastics
& Synthetics
Division
A k r o n 9 , Ο hi o
For further informatian, circle number 52 A on Readers' Service Card, page 47 A
52 A
» * * The instrument's double monochromator utilizes a fused silica prism in series with a 600-line-per-mm. echelette grating. This combination of dispers ing elements is said to provide the high resolving power and low temperature coefficient which are possible with the grating at long wave lengths, yet re tains the optical efficiency and low scatFor further, information, see coupon on page 47 A ANALYTICAL
CHEMISTRY
Handling Hazardous Materials? tered light characteristics of t h e prism monochromator. Entrance, interme diate, a n d exit slits of t h e u n i t are curved and are simultaneously adjustable in width from 0 t o 3.0 m m . T h e resolving power of t h e mono chromator is about 1.0 A . in t h e ultra violet a n d visible ranges, and a b o u t 3.0 A. in t h e near-infrared. Scattered light is less t h a n 0 . 0 0 0 1 % in t h e ultra violet a n d visible ranges, less t h a n 0.01% in t h e near-infrared. Accuracy of t h e i n s t r u m e n t is claimed t o be ± 0 . 0 0 2 absorbance units or 0 . 2 % of t h e absorbance being read, whichever is greater. 9 Kjeldahl Reagents
Test chemicals for Kjeldahl nitrogen determinations, mixed a n d ready t o d r o p into t h e test flask, *" " " """" ' are available in polyethylene-pack aged form from Laboratory Rea gents, I n c . K e l P a k Powders elim inate t h e need t o stock, mix, a n d measure out indi vidual reagents. The powders are available in three standard formulas for de terminations by Kjeldahl method, Gunning method, or Kjeldahl-WilfarthGunning m e t h o d . T h e formulas con form t o AOAC standard methods. T h e polyethylene package containing the powders is inert. I t is claimed t o reduce foaming and t o h a v e no effect on test accuracy. 10
Send for this f r e e book explaining
the C B R System for your laboratory ^i^dllSili^iÉiliii The C-B-R System—Chemical, Biological, Radiological— is Kewaunee's latest contribution to safety, convenience, efficiency and economy in the laboratory handling haz ardous materials. Based on the watchwords "concentrate-confine", it pro vides vital protection to technicians and other laboratory personnel, whether the materials handled are in the field of isotopes, explosives, solvents or toxic materials. It pro vides remarkable flexibility and operating economy. It assures outstanding efficiency and convenience. And it's all explained in the new free book "The CBR System by Kewaunee." So if your laboratory is handling hazardous materials of any kind, we invite you to send for this book today. It's yours for the asking—and there's no obligation.
The Kewaunee "CBR Twosome"
Kewaunee Mfg. Co. J. A. Campbell, President ' 5090 S. Center Street · Adrian, Michigan Representatives in Principal Cities
"Single Unit" for remote control
For further information, circle number 53 A-1 on Readers' Service Card, page 47 A
Parr
API Standard Samples Recently added t o t h e series of American Petroleum I n s t i t u t e standard samples of hydrocarbons are 2,4-dimethyl-3-ethylpentane a n d cyclohexylcyclohexane. T h e y are offered in quan tities of 5 ml. sealed in a special borosilicate glass ampoule. Π
Oxygen Bomb Sulfur Apparatus •
Vacuum Pump Flushing Oil An oil for flushing mechanical v a c u u m p u m p s without risk of contamination from detergents or volatile additives is being sold b y Central Scientific Co. Cenco H y v a c flushing oil is claimed t o be ideal for removing old oil, sediment, and dirt which m a y accumulate in t h e internal mechanism of a p u m p . Addi tives found in conventional automobile For further information, see coupon on page 47 A
For r a p i d , accurate d e t e r m i n a t i o n o f Sulfur, H a l o g e n s , A r s e nic, Boron a n d many other elements i n c o m b u s t i b l e o r g a n i c m a terials. Meets A . S . T . M . Requirements f o r : D - I 2 9 - 5 I . D 271-48. D 808-51Τ and D 833-46T.
The Series 1900 apparatus consists o f a PARR Oxygen Bomb and all accessories f o r the combustion o f analytical samples when calorific measurements are not required. Either single or double valve bombs can be furnished. Ask your PARR dealer f o r information and prices or write the factory.
PARR EST. Î899
·
INSTRUMENT CO..
MOLINE, ILLINOIS
MAKERS OF CALORIMETERS AND PRESSURE REACTION EQUIPMENT
For further information, circle number 53 A-2 on Readers' Service Card, page 47 A
NEW PRODUCTS lubricating oils can readily contaminate a high vacuum system, according to the company, and may be nearly impossible to remove. The oil is packaged in quart bottles and gallon cans and is intended for flushing only, and not for high vacuum pumping. 12 Laboratory Stirrer
as revealing as your fingerprint Because it offers a completely fresh approach to the study of chemical systems, Varian's Model V-4300 High Resolution n-m-r (nuclear magnetic resonance) Spectrometer has become an instru ment of major importance to analytical chemists everywhere. Now at work in research laboratories throughout America, this remark able new device detects signals from H \ F1? P3! B", C13 H i N 1 * and several other nuclei, revealing the character of the chemi cal environment. High Resolution n-m-r techniques permit rapid, non-destructive analysis of small liquid samples, including melted solids, solids in solution and liquefied gases. Prominent applications include iden tification of functional groups, equilibrium and kinetic studies, assignment of structural formulas and analysis of multi-component mixtures. THIS IS N M R AT WORK „t SPECTRA CTTWO S « « ™ ™ " Ζ « ^ ^ Hvdroeen in gasoline is present in aJ < east " Q gauss . These are: °* environments which can "= ' ^ ' f . ^ p Ssattached to doubly M , Sample Volume: .03 cc. ™'° s a t t a c b e d to „.m,t.rm». ff J ' t 0 an a , on , a t,c TA
GASOLINE BRAND
m$
B__^^,
m$&$ i&nl't
fe-SH ^^rTBOVÎSPÉCTRUIn ABOVE SPE
ABOVE SPECTRUM - VERTICAL SCAlE ; l EXPANDED ^ ^ . ^
V/ΠΗ g
- EXPANDED
!;r!U±v
WêiïiïM
iPiÉlP
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An electronic-controlled, adjustable speed stirrer is being marketed by Ace Glass, Inc. The apparatus has a series wound, d . c , gear head motor driven by a phase shift thyratron-tube-controlled rectifier, which converts alternating current to direct current. The d.c. motor supplies adequate power at low speeds and does not tend to heat up a t low voltage. The motor has both direct drive and gear drive. Speed on the direct drive shaft is about 400 t o 4000 r.p.m. in stepless control; speed on t h e gear-driven shaft is '/isth the direct speed. The motor is Vso hp. and can be run in either direction. 13
Chromatographic
Columns
Ultramax chromatographic and ion exchange columns, supplied by Fischer & Porter Co., permit variable column lengths with a single unit. Filter disks are removable, so t h a t various filter porosities can be used as required. Effluent is controlled by a F & P Ultramax valve, which requires no lubricant. The glassto-glass coupling can be quickly disassembled for cleaning. By use of a second coupling and filter disk a t t h e top of the unit, t h e column may be run in continuous back flow operation. Stock sizes of 1 / 4 -, 3 / 8 -, V r , 3/t-, a l l d 1-inch heavy-walled tubing with porcelain filter disks are available. 14
5H;;IÎ
Hot Plate-Magnetic Stirrer FOR THE COMPLETE STORY . . . On Varian's Model V-4300 High Resolution n m r Spectrometer, as well as the Model Y-4200 Variable Frequency n-m-r Spectrometer, write to the Special Products Division for: THE MARK OF LEADERSHIP
• Technical Information Bulletins • Data Sheets • nm r Table
V A R I A N associates P A L O
A L T O
4,
C A L I F O R N I A
For further information, circle number 54 A on Readers' Service Card, page 47 A
54 A
A combination hot plate and magnetic stirrer t h a t makes it possible t o heat liquids while stirring them magnetically is offered by Arthur S. LaPine & Co. The base of the compact apparatus is a light casting t h a t houses the controls for heating and stirring, as well as t h e stirrer motor. The h o t plate assembly plugs into t h e top of t h e base and can For further information, see coupon on page 47 A ANALYTICAL
CHEMISTRY
NEW PRODUCTS be easily removed. A stainless steel support rod threads into the base. A rheostat controls the speed of the stirrer motor. An input controller pro vides variable heating from 0 to 400 watts. Stirring and heating are inde pendent of each other and can be used separately or together. 15 lodometry Indicator
Tracerlab. AMERICA'S OUTSTANDING SCALER LINE. . . FOR EVERY NUCLEAR NEED
Thyodene, a solid indicator said to be useful in replacing starch for iodine and iodometry, is being offered by Purkis, Williams, Ltd. The material is marketed as a fine powder which is soluble in cold water and can be added without further prep aration to solutions to be titrated. In quantities of about Ο.δ gram, it produces a typical blue starch iodine color with free iodine. 16
τη
\
Triple Beam Balance
A new triple beam balance, the CentO-Gram Model C.G. 311, has been an nounced by Ohaus Scale Corp. It has a. sensitivity of 0.01 gram and a capac ity, with two 100-gram attachment weights, of 311 grams. Graduated beams, pan, and other ex posed parts are constructed of stainless steel. Polished agate bearings are mounted so as to be free to align them selves with the beam knife edges, elim inating friction and providing greater sensitivity. 17
mms: Tracerlab's customer-engineered scaler line . . . with a model for every application . . . is another indication of Tracerlab's position as the largest and leading firm in the nuclear in dustry. Models are available for preset count and time operation, pulse amplification, high speed, automatic operation, and decade or binary scaling. If you will indicate your counting requirements, we will be pleased to recommend the proper equipment. ask for Catalog DX, with complete specifications. Sales Offices: New York, Washington, Chicago, Cleveland, Houston, Paris
130 HIGH STREET, BOSTON 10, MASS. 2030 WRIGHT AVE., RICHMOND 3.CALIF. Circle No. 55 A-1 on Readers' Service Card, paie 47 A
Instrument for Welding Thermocouples
The Kup-L-Wekl has been introduced by Burrell Corp. for making thermo couples in the laboratory. By use of the device, says Burrell, welds can be safely and easily made by adding flux to the metal, touching the couple to an electrode, and pushing a button. Many different metals in wire sizes from 14 to 30 can bo joined. All components of the unit are en cased in a single compact housing. An adjustable filter mounted on top of the housing protects the operator from flash. Installation requires only a con ventional 1 Ιό-volt, 60-cycle outlet. 18 Colorimeter Cell Carrier
A liquid-cooled double cell carrier for use with Bausch & Lomb's Spectronic 20 colorimeter has been developed by Arthur H. Thomas Co. The device is claimed to make the colorimeter suit able for rapid spectrophotometric scan ning at controlled temperatures. For further information, see coupon on page 47 A
V O L U M E 2 6, NO. 11, N O V E M B E R
1954
N E W S from FILTERTOWN The tremendous growth of filter paper chromatography has spot lighted the importance of E&D filter papers. These are qualitative papers of low ash content, neutral, sub stantially free of solubles, with a reputation for dependable uniform ity since 1890 . . . Recent reported tests include the use of E&D papers to determine the course of action of polygalacturonase on polygalacturonic acids; also to detect and isolate substances by electromatography . . . E&D filter papers are made by the only company in America exclusively devoted to the manufacture of filter papers. Dur ing 1953, the world's laboratories used the tremendous total of 16,478,000 E&D filter circles in the popular 11 and 12.5 cm. s i z e s . . . In addition, they used 309,500 E&D folded circles in the same s i z e s . . . Folded circles were pioneered by E&D. Today they are available in many grades and in sizes up to 50 cm. . . . For free samples, write to T. J. Druding, sales manager . . . Your local scientific supply house is now able to supply you with E&D filter papers in the new, "keep c l e a n " , easy to store box of LAB-PAK 200. Recently introduced, this new package with 200 filter circles has met with immediate approval from the scientific world . . . More news at a later date. Your comments and questions are extremely welcome.
THE
E&D FILTER PAPER
EATON DIKEMAN CO. FILTERTOWN
MOUNT HOLLY SPRINGS, PA. Circle No. 55 A-2 on Readers' Service Card, page 47 A
55 A
Experimentally Speaking... NfW PRODUCTS
Have you considered Lithium as a REAGENT? TAKE A LOOK AT LITHIUM . . . A RECOGNIZED REAGENT IN ORGANIC SYNTHESIS LITHIUM METAL
REAGENTS
Application: Organic Chemistry— Lithium organic compounds, both alkyls and aryls, are used to advantage in organic synthesis of the Grignard type, particularly where the mag nesium Grignard reacts sluggishly or in poor yield. They are also used for the preparation of organometallic compounds of other metals.
Analytical C h e m i s t r y Lithium is used as an analytical nitrogen in rare gases.
reagent
for
Metallurgy— Lithium is used in metallurgy as a degasifier, deoxidizer, desulfurizer and general purifying agent, particularly for copper and copper base alloys.
Availability. Ingot—1#, iy 2 #, or 2# each Cup—VB# each Rod—Va'' or Vs" Dia. Wire—x/%"1 Dia. l Ribbon— /A" or /z" Shot—4 to 8 Mesh LITHIUM AMIDE
Cartridge—2.25, 4.50, 9.0 and 108.0 Gram (Encased in Copper Tubing) Special forms as specified
REAGENT
Application: Organic Reactions —Claisen condensations —Alkylation of nitriles and ketones —Synthesis of ethinyl compounds —Synthesis of acetylenic carbinols Availability: Crystalline Powder LITHIUM HYDRIDE REAGENT
Application: Organic Reactions —Used in the preparation of Lithium Aluminum Hydride (LiAlH*). —Condensing agent. Starting point for various double hydrides.
T h e Roto-Cell replaces t h e singleplace sample holder regularly supplied with the instrument. I t permits rapid interchange within t h e colorimeter of a 1-ml. sample with a blank or standard, thereby facilitating preparation of spec tral transmission or absorption curves. T h e device consists of a swivel action water-jacketed holder, a slotted carrier for two 1-ml. cells having 10-mm. light paths, and a control knob with stops for positioning either cell or for com pletely blocking the light beam to check dark current adjustment. T h e holder has an inlet and an outlet for attaching an external cooling system for use in maintaining the cells a t optimum work ing temperatures. 19
Waring Blender A Waring Blendor of 1-gallon capacity for blending, pulping, and mixing larger quantities of materials t h a n could be handled b y previous models is now avail able from Central Scientific Co. I t has five speeds ranging from 8000 t o 16,000 r.p.m. T h e Blendor has a stainless steel con tainer with a handle for easy pouring. T h e container h a s a two-section cover with snap-on latches and a removable Plexiglas lid for sampling or adding ma terial. 20
Drying Agent —Shows extreme avidity for H2O; useful as a desiccant.
Hydrogen Generation
Proportional Counter Converter
Write Suite Ρ for Data Sheets on Any Or All of the Above Listed Products
A proportional counter converter with built-in low voltage power supply and needle valve for gas flow control has been developed by Nuclear Measure ments Corp. T h e unit, Model PCC-14, converts any scaler with a high voltage range of 600 to 2000 volts to a propor tional counter. T h e instrument can be used to count alpha and both hard and soft beta ac tivity. I t will count such samples as precipitates, evaporated salts, com pressed pellets, and filtered materials. I n p u t sensitivity is set a t 0.001 volt and is adjustable from 0.0005 to 0.0025 volt. Connections required are to a 115-volt a.c. line, t o a cylinder of count ing gas, and to t h e input of the scaler. 21
. . . trends ahead in industrial applications for Lithium
Vacuum Gage
—When reacting with H2O generates approxi mately 45 cubic ft. per lb. reduced to 0°C. and 760 mm. at pressures as high as 2100 lb. per sq. in. and at rates as high as 8 cubic ft. per min. per lb. One cubic ft. of LiH weighing about 50 lbs. will generate 2250 cubic ft. of H2 reduced to 0°C. and 760 mm.
Availability: Six standard particle sizes A N D TAKE A LONG LOOK A T THE REAGENT POSSIBILITIES OF THESE LITHIUM SALTS: Lithium Bromide Lithium Carbonate Lithium Chloride Lithium Hydroxide (Monohydrate)
CORPORATION L CI LITHIUM OF AMERICA, INC.
Ά
GENERAL OFFICES: Rand Tower Minneapolis 2, Minnesota Mines: Hill City, Keystone, Custer, South Dakota · Bessemer City, North Carolina · Cat Lake, Manitoba · Amos Area, Quebec Chemical Plants: St. Louis Park, Minnesota · Bessemer City, North Carolina · Research & Development Lab oratory: St. Louis Park, Minnesota Circle Nos. 56 A-1, 56 A-2, 56 A-3, 56 A-4 on Readers' Service Card, page 47 A
56 A
An Alphatron vacuum gage t h a t oper ates on alternating current is being offered by Naresco E q u i p m e n t Corp. T h e Model 517 gage has six ranges for measurement of pressures from 1000 to 0.0001 m m . of mercury on a linear scale. Response is claimed to be in stantaneous, permitting quick readings. For further information, see coupon on page 47 A
ion
Xchange
LABORATORY SIZE OF CARTRIDGE DE-IONIZER GIVES MINERAL-FREE WATER The latest development in ionXchange equipment is the mixed-bed de-ionizer, which combines both anion and cation resins in one vessel or tank. The unit shown below is a miniature model of such a de-ionizer, made up in such a manner as to be an ideal accessory in any laboratory where mineralfree water is wanted occasionally in compara tively small quantities. The ILLCO-WAY Cartridge De-Ionizer consists of a plastic tubular column containing 3 lbs. of mixed resin. When the resins are exhausted, as shown by a change in color, the entire cartridge can be discarded and a fresh one substituted. N o electrical connections are needed. The column can be clamped, as shown, in any convenient location or manner. RESEARCH MODEL
Produces water comparable to that obtained by triple dis tillation. Removes all ionizable solids, including silica and CO 2.
CAPACITY-450
grains
FLOW RATE - s g P h PRICE (FOB Rockford)— $ 1 2 . 5 0 BRACKET (Extra) — $5.00 UNIVERSAL MODEL
Produces water comparable to that obtained by single dis tillation. Removes all ioni2able solids except silica and CO 2.
CAPACITY-900
grains
FLOW R A T E - s g P h PRICE (FOB Rockford)-$9.75 BRACKET (Extra) · $5.00 Write for fully descriptive literature Bulletin C A - 2 5 4
ILLINOIS WATER TREATMENT CO.
ionXchange 8 3 5 CEDAR ST. ROCKFORD, ILLINOIS NEW YORK OFFICE: 141 E. MTH ST., NEW YORK 17. N.Y. CANADIAN DIST; PUMPS «. SOFTENERS, LTD. LONDON, ONT.
Circle No. 56 A-S on Readers' Service Card, page 47 A
ANALYTICAL
CHEMISTRY
MANUFACTURERS' LITERATURE joints, adapters, high vacuum stop cocks, and flanges distributed by Roch ester Scientific Co. {Quickfit). 25
A connection is provided for a recorder. The gage utilizes a sealed radium source. The source emits alpha par ticles to produce ionized gas molecules which are collected on a plate and pro duce a current for indicating the meas ured pressure. The gage cannot be damaged by exposure to atmospheric pressure, according to the company, because the ion source operates at room temperatures and at zero potential. 22
Pumps. Folder of 3 pages describes construction and operation of laboratory pump that forces liquids, solutions, or gases through rubber tubing without corrosion or contamination in pump. Schaar & Co. (Sigmamotor Pump). 26 Power Demand Meters. Two-page sheet describes printing power demand meters for use in combination with wattmeters or totalizing devices to pro vide printed record of power demands. Streeter-Amet Co. 27
MANUFACTURERS' LITERATURE
Thermistor Thermometers. Sheet of 2 pages gives information about port able, remote reading thermistor ther mometer available with ranges covering - 2 3 ° to 100° C. for laboratory and field research. The Yellow Springs Instrument Co., Inc. {Tele-Thermom eter). 28
API Standard Samples. Two lists to taling 18 pages give information con cerning 25 organic sulfur compounds and 226 hydrocarbons available as American Petroleum Institute standard samples. Carnegie Institute of Technology. 23 Glassware. Catalog of 16 pages gives data on glass tubing and rod, capillary tubes, low pressure gage glass tubes, glass cylinders, glass wool fiber, and other scientific glassware items. Friedrich and Dimmock, Inc. 24 Ground Joints and Stopcocks. Bul letin of 8 pages lists sizes and prices of conical and spherical ground glass
Microhardness Testers. Brochure of 48 pages discusses theory and practice of microhardness testing with Reichert tester. William J. Hacker & Co., Inc. 29 Stress Measurement. Five-page re print of paper describing theory, con
HOW MUCH DO YOU KNOW ABOUT SONICS?
Grignard Reagents. Bulletin of 4 pages lists available Grignard reagents and discusses uses and recommended han dling procedures. Arapahoe Special Products, Inc. 34 Analytical and Control Instruments. General catalog of 12 pages covers line of mass spectrometers, leak detectors, For further information, see coupon on page 47 A
DIFFUSION PUMPS AUTOMATIC TOEPLER PUMPS McLEOD GAUGES—with or without Ground Capillaries MELTING POINT APPARATUS ALL TYPES OF GRADUATED GLASSWARE
RAYTHEON MANUFACTURING COMPANY MASSACHUSETTS
DISTRICT OFFICES: Boston, New York, Cleveland, Chicago, New Orleans ~.os Angeles (Wilmington), San Francisco, Seattle. I N T E R N A T I O N A L DIVISION: 19 RECTOR ST. NEW YORK CITY
SPECIAL APPARATUS
ECK & KREBS, I N C .
RAYTHEON]
SONIC OSCILLATORS Circle No. 57A-1 on Readers' Service Card, page 47 A
V O L U M E 26, NO. 1 1 , N O V E M B E R
Organic Chemicals. Price list of 16 pages covers bioehemicals, amino acids, pharmaceuticals, and other special chemicals available from WinthropStearns, Inc. 33
HIGH VACUUM STOPCOCKS—Pre cision Ground Our Specialty
Write for detailed bulletins and literature on recent applications in research. Address Dept. 6120-AC.
54,
Chromatography Equipment. A 24page catalog describes equipment, ap paratus, and supplies, including sol vents and adsorbents, for chromato graphic work. Will Corp. 32
One of the many new items in new List
Industrial laboratories find Raytheon Sonic Oscillators pro vide a quick and complete answer to questions about the effects of sonic vibration in chemical and industrial proc esses. Compact, easy to use, highly efficient, they are practical research tools that no well-equipped laboratory should be without.
SALES DIVISION, WALTHAM
Balances. Advantages and specifica tions of 1-pan, constant sensitivity balance with capacity of 200 grams and sensitivity of 0.1 mg. presented in 4page folder. Wm. Ainsworth & Sons, Inc. (Right-A-Weigh). 31
762 JACKETED BURETTE
"We don't want anyone lo know more than we do about sonics in industrial research. H e use a Raytheon Sonic Oscillator lo investigate potential applications."
EQUIPMENT
struction, and advantages of new in strument for measuring stress in electrodeposits. Joseph B. Kushner Electoplating School. 30
1954
27-09—40th AVENUE LONG ISLAND CITY 1, Ν. Υ. Manufacturers
of Scientific Glass Apparatus
and Instruments
Circle No. 57 A-2 on Readers' Service Card, page 47 A
57 A
