PRODUCT CAPSULES For your convenience — short "refreshers" on last month's ads. Follow directions on page 61 A to ob tain free information on products and services described
EQUIPMENT AND INSTRUMENTS Analytical Instruments. Circle indi cated numbers for full information on instruments used in the following analytical methods: flame photometry, 60A-1; pH, automatic titration, 60A2; fluorimetry, 60A-3; nephelometry, 60A-4; spectrochemistry, 60A-5; and colorimetry, 60A-6. Coleman Instru ments, Inc., 318 Madison St., Maywood, 111. 60A-1 to 6 Analyzers, Nuclear. Full information available on company's neutron absorp tion analyzer that features: 1. Non destructive analysis. 2. Speed (ap proximately 1 minute). 3. Accuracy. 4. Sampling or continuous control sys tem. Nuclear Div., American Elec tronics, Inc., 655 W. Washington Blvd., Los Angeles 15, Calif. 63A Anenometers. Bulletin available on company's universal anenometer that reads wind velocity in kilometers per hour, miles per hour, or knots. The three units can be used interchangeably. Wind-powered. Accurate within 2 % at velocity from 2 to 100 mpli. Circle 70A-1. Also available are bulletins on company's water current meters (70A-2) and water level recorders (70A-3). W. & L. E. Gurley, 523 Fulton St., Troy, N. Y. 70A-1,2,3 Balances, Analytical. Complete file available on Mettler balances that are cited as making 3 to 5 weighings per minute. Unit provides highest pre cision and excellent readability, companv states. Mettler Instrument Corp., Box 242, Hightstown, N. J. 42A
viding fast, accurate operation. 1,610 grams capacity. 0.1 gram sensitivity. W. M. Welch Scientific Co., 1515 Sedg wick St., Dept. E, Chicago 10, 111. 35A-1 Blenders, Twin-Shell. Catalog avail able on twin-shell blender cited as provid ing scale-up of lab tests to production run. Available with lucite or stainless steel shells in sizes from 1 pint to 8 quarts. The Patterson-Kelley Co., Inc., 2330 Lackawanna Ave., East Stroudsburg, Pa. 61A-1 Boiling Chips. Free samples available of company's micro-porous chemically inert carbon chips that are recom mended to prevent "bumping" of aque ous or non-aqueous boiling liquids either at atmospheric pressure or under vacuum. Todd Scientific Co., Spring field, Pa. 13A-2 Carbon Analyzers. Catalog available on new model cited as providing 2 minute carbon determinations. Clean design provides accuracy with a sim plicity of operation and low mainte nance cost. Harry W. Dietert Co., 9330 Roselawn Ave., Detroit 4, Mich. 29A-2 Cathetometers. Features cited for company's cathetometers include: verti cal range 100 cm; vernier reading to 0.05 mm; working distance 45 cm to infinity; magnification 12x at 45 cm, 8x at infinity; level sensitive to 50 seconds. W. M. Welch Scientific Co., 1515 Sedgwick St., Dept. A, Chicago 10, 111. 58A
Balances, Analytical. Company states that the "Projectomatic" has an accuracy of reproducibility of Vio mg· for all weights up to 200 grams and can be read directly to Vu m g · Unit also features magnetic dampers, scientifically designed metal case, double pans for taring, arcing beam arrest mechanism, and individual pan arrest. Christian Becker Div., The Torsion Balance Co., Clifton, N . J. 76A Balances, Trip-Scale. Full informa tion available on low form triple-beam trip-scale balance that is cited as pro V O L U M E 28, N O . 4, A P R I L
1956
Cells, Absorption. Circle 40A-3 for complete information on Klett glass absorption cells. Klett Mfg. Co., 177 East 87 St., Ν. Υ. 40Α-3 Colorimeters, Photoelectric. Litera ture available on the Lumetron color imeter for nessler tubes. A new photo electric instrument of high accuracy for the measurement of pale colors and faint turbidities. Photovolt Corp., 95 Madi son Ave., New York 16. 27A-3 Densitometers. Bulletin available on densitometer for partition chroma tography and paper electrophoresis. Photovolt Corp., 95 Madison Ave., New York 16. 27A-2 Desalters. Catalog available on the complete line of Reco chromatographic equipment. Includes information on the Reco electric desalter that removes inorganic salts without equivalent losses in organic and amino acids. Research Equipment Corp., 1135 Third St., Oak land, Calif. 56A-2 Dewar Flasks. Information available on company's custom-built or standard dewar flasks for storage of liquefied gases (including helium and hydrogen). Made of Pyrex glass without separation pads, they are available in either cylin drical or spherical shapes. H. S. Martin & Co., 1916-20 Greenleaf St., Evanston, 111. 3rd Cover Distillation Trains. Information avail able on vacuum distillation train in a single compact unit. Occupies a space For further information, see coupon on page 61 A
Surveys a n d comments h a v e shown that A N A LYTICAL readers a p p r e c i a t e a n d use the a d v e r tising p a g e s as v a l u a b l e sources o f technical a n d industrial information. They consider the ads as an important technical supplement to the e d i t o r i a l p a g e s . To increase further the v a l u e o f these advertisements to r e a d e r s , this section will present in each issue b r i e f , informative descriptions o f the products, equipment, a n d services advertised in the previous month's issue.
51 A
Product Capsules 12" square, 18" high. Unit has a manomer with a mirror metric scale. Delmar Scientific Labs., 4701 W. Grand Ave., Chicago 39, 111. 12A-1
mechanical extractcr swing through a 90° arc and the rocker oscillates at a rate of 20 times per minute. Eight 100 ml. extractions can be made at one time. Overall dimensions' 17" wide X 10" deep X 6V2" high. Scientific Glass Apparatus Co., Inc., Bloomfield, N. J. 15A-1
Evaporators, Rotating. Full informa tion available on the Rinco rotating vacuum-type evaporator. Adaptable for volumes of 1 ml to 500 ml. Can be used in single or multiple units. Flasks rotate at 93 rpm. A. S. Aloe Co., 5655 Kingsbury, St. Louis 12, Mo. 50A-1
Filter Papers, Analytical. Analytical filter paper sampler available. Com pany's filter papers are cited as having less than 0.007% ash content. Carl Schleicher & Schudl Co., Dept. AC-3, Keene, Ν. Η. 32Α
Extraction Rockers. The separatory funnels on company's "Extracto-Matic"
Filter Papers, Chromatographic. Free samples available of Eaton-Dikeman filter paper for chromatography. Papers are available in standard size sheets, rolls, circles, or special sizes and shapes. The Eaton-Dikeman Co., Mt. Holly Springs, Pa. 69A-1 Filters. Bulletin available on company's new lightfoot filter that consists of a sliding molded "Teflon" filter plate within a stainless steel shell. Concen tric and radial grooves on the plate sur face conduct the filtrate to the stem. New York Laboratory Supply Co., Inc., 76 Varick St., New York 13. 29A-1 Flash-Evaporators. Complete infor mation available on unit with inter changeable evaporating flask from 100 ml. to 2000 ml. Adjustable speed from 40 to 180 rpm. Teflon and glass rotat ing joint eliminates lubrication. For batch or continuous operation. Labglass, Inc., 514 West 147 St., New York 31. 30A-2
CUSTOM MADE
LABORATORY GLASSWARE
Fluorimeters. Klett fluorimeters are cited as being designed for the rapid and accurate determination of thiamin, riboflavin, and other substances which fluoresce in solution. Klett Mfg. Co., 179 E. 87 St., New York. 65A-2 Freeze-Drying Units. Descriptive folder available on company's complete line of freeze-drying apparatus. Line includes the bio-dryer, the histological freeze-dryer, the micro unit, the macro unit, the super unit, the all-glass modi fied Campbell-Pressman unit, and the freeze-mobile. E. Machlett & Son, 220 E. 23 St., New York 10. 67A-2
Brand new 1956 special apparatus catalog makes it easier than ever to obtain hard-to-get glass labware If you're one of the relatively few scien tists who need unusual kinds of glass ap paratus, this 1956 catalog may be of considerable help to you. Its well-illustrated pages give you lots of information about glassware we make to order for you. Its pages hold even more examples of special glass than did the first edition.
To obtain your copy of CA-2: "Custom-Made Laboratory Glassware by Corning," simply mail the coupon below. (If you need special apparatus not in this new catalog, simply send us a rough sketch of the item you need, with dimen sions. We will be j'lad to quote price and delivery.) Mail this coupon today!
C&z*uk& /xearté œeaeazcd ck- &cc&}j CORNING
GLASS
WORKS
69-4 Crystal Street, Corning, New York
Please send me your new catalog CA-2: "Custom-Made Laboratory Glassware by Corning." Name
.Tîïie..
Company-
Funnels, Separatory. Complete infor mation available on the Ultramax separatory funnel. Funnel is corrosion resistant and requires no lubricant. Sizes: 30 ml. to 2 liters in globe, squibb, or cylindrical types. Fischer & Porter Co., 1536 County Line Rd., Hatboro, Pa. 37A Furnaces, Induction. Complete tech nical data available on company's new line of high-frequency furnaces for car bon and sulfur analysis by induction heating. Laboratory Equipment Corp., St. Joseph 8, Mich. 73A-1 Fusion Cups. List available on Parr fusion cups machined from solid bars of special nickel alloys. No seams or welds. Surfaces are finished to close tolerances and each cup is individually pressure tested. Parr Instrument Co., Moline, 111. 75A
Street City
Zone.
..Statu.
For further information, circle number 52 A on Readers' Service Card, page 61 A
52 A
Glassware, Borosilicate. Company states that each piece of its volumetric (Continued on page 64) ANALYTICAL
CHEMISTRY
Product Capsules glassware bearing the letter "A" indi cates that it meets guaranteed class A capacity tolerances as set forth by the National Bureau of Standards. Corning Glass Wks., 72-3 Crystal St., Corning, Ν. Υ. 47 A Glassware Washers. Complete de tails available on the 1956 model S/C washer made entirely of stainless steel, featuring powered brush washer. All brushes are interchangeable and are available in all shapes and sizes. Chi cago Apparatus Co., 1735 No. Ashland Ave., Chicago 22, 111. 28A-3 Guide,
Quantitative
Analysis.
"Essentials of Quantitative Analysis," a complete working guide to basic opera tion by A. A. Benedetti-Pichler, Profes sor of Chemistry, Queens College, has just been published. 126 illustrations, tables; 732 pages, $15. The Ronald Press Co., 15 E. 26 St., New York 10. 3 0 A-1 Hand Torch. Bulletin available on the Bethlehem "Polymix" used for Pyrex, Vycor and quartz. Also used for metalworking. An oxy-gas hand torch, it is cited as being noiseless, light-weight. Bethlehem Apparatus Co., Inc., Hellertown, Penn. 69A-2 Hot Plates. Complete data available on company's hot plate that is cited as
providing a wide temperature range, and close control (less than 5° F. variation). Unit plugs into 110 V., 50/60 Cy. Thermo Electric Mfg. Co., 478 Huff Street, Dubuque, Iowa. 35A-2 Instrument Benches. 20-page illus trated catalog available on company's universal instrument bench that con sists of over 60 components of various types that can be assembled into hundreds of different combinations. Used for sedimentation tests, particle size determinations, turbidity tests, photometry, etc. Meyer-Opticraft, Inc., 39 W. 60 St., Ν. Υ. 23. 61A-2
Laboratory Furniture. 180-page cata log available on company's line of fire proof, waterproof, corrosion resistant, rustproof, laboratory furniture. Metalab Equipment Co., 252 Duffy Ave., Hicksville, Long Island, Ν. Υ. 56A-3
Lamps, Ultra Violet. Informative, de tailed, 16-page brochure, "Photosensitization" available. Contains informa tion on the Hanovia utility model quartz lamp that provides high intensity con centrated source of ultra-violet radi ations. Hanovia Chemical & Mfg. C o , 100 Chestnut S t , Newark 5, N. J. 65A-3
Joint Clamps. Company's joint clamps are designed for standard taper glass joints and fit all makes of joints with a positive lock. Simple screw adjustment for clamping pressure. Aluminum con struction. Manostat Corp., 20-26 N. Moore St., Dept. 101, N. Y. 13. 55A Laboratory Equipment. Circle indi cated numbers for complete information on the following laboratory equipment: 45,000 rpm or 23,000 rpm homogenizers, 34A-1; "Extraci,o-Matic" extraction rockers, 34A-2; separatory funnels, 34A-3; freeze-drying units, 34A-4. Arthur S. LaPine & C o , 6001 S. Knox Ave., Chicago 29, 111. 34A-1 to 4
Mcleod Gauges. Details available on Ace McLeod gauges with "trubore" tubing that provides accuracy and interchangeability within each pressure range. Gauge will hold at any position to which it is rotated. Ace Glass, Inc., Vineland, N. J. 24A Mercury Diffusion Pumps. Full de tails on company's two-stage pump available. Gas intake is 20 liters per second. Pump takes hold at 8-10 mm fore pressure with ultimate pressure of 10^ s mm. Wakefield Industries, Inc., 5108 W. Grove S t , Chicago, 111. 40A-2
Mercury Vapor Detectors. Units are portable, ultra-violet photometers, cali brated in mercury concentrations. Weight: 7 pounds; size 13 X 8V2 X 4V2 inches. Harold Kruger Instru ments, Box 164, San Gabriel, Calif. 40A-1
met
χΛ+,ίί/,,Λ, in a most comprehensive range of types and capacities to better meet your particular needs. l a n d ^ i n stock for immediate shipmont,
Microscopes, Polarizing. Complete catalog on "Unitron" microscopes avail able. Includes information on com pany's polarizing microscope for the study and identification of material structure and characteristics. United Scientific C o , 204-6 Milk S t , Boston 9, Mass. 28 A-1 Mortars, Pestles & Girders. Circle 9A-1 for complete information on com pany's permanently lubricated, auto matic mortar grinder. Circle 9A-2 for complete information on company's mortars and pestles. Fisher Scientific Co, 100 Fisher Bldg, Pittsburgh 19, Pa.
including center a n d side necks. v-,. Ask Dept. 3 N - F
to send you catalog ' ' 5 0 "
' i j ^ h o w i n g complete listing.
ACE GLASS INCORPORATED 6945
V I N E L A N D A NEW JERSEY ÎQUISV1LLE, KY., 639-41 SOUTH HANCOCK ST. Glassware specialiststo Industry and Research
Far further information, circle number 54 A i j n Readers' Service Card, page 61 A
54 A
9A-1,2
Needle Valves. Bulletin available on company's teflon and glass needle valves that are cited as eliminating the possi bility of breakage and contamination: Liquid comes in contact with only glass and teflon. The Emil Greiner C o , 2026 N. Moore S t , New York 13. 5A Ovens, Vacuum. Bulletin available on vacuum oven for low pressure or atmospheric drying. Chamber size: (Continued on page 56 A) ANALYTICAL
CHEMISTRY
Product Capsules IV2 cubic feet, 12 X 12 X 18" deep. Temperature range 200° C. National Appliance Co., Portland, Oregon. 71A-2 Paper Electrophoresis Systems. De tails available on the Spinco "Analytrol" that plots the distribution curve of material concentration derived from light transmission, while it produces an integral, saw-tooth curve, from which relative concentrations can be read directly. Spinco Div., Beckman Instru ments, Inc., Belmont 7, Calif. 8A Pellet Presses. Bulletin available on press used for making KBr pellets for infrared spectroscope analysis. 20 ton capacity. Bench mounted, hand oper ated. Loomis Engineering & Mfg. Co., 133 S. 14 St., Newark 7, N. J. 10A Ph Meters. Bulletin available on com pany's line-operated pH meter cited as being simple in operation and mainte nance, fast and dependable, and fully stabilized for wide range of line voltage fluctuations. Photovolt Corp., 95 Madi son Ave., N. Y. 16. 27A-1 Porcelain Catalog. Circle 73A-2 for the 1956 copy of Coors catalog on chemi cal and scientific porcelain. Coors Porcelain Co., Golden, Colorado. 73A-2
Power Supplies. Details available on company's new, tubeless, magnetic amplifier. Wide range, continuously adjustable voltage at high current. Regulation ± 0 . 5 % against line or load, ripple 1% RMS. Sorenson & Co., Inc., 375 Fairfield Ave., Stamford, Conn. 48A Presses, Hydraulic. Catalog available on Carver laborato-y presses. Unit is used for forming KBr pellets, dehydrat ing, pressing out oils, filtering thick fluids, determining fatty acids, etc. Available in 10- and 20- ton models. Fred S. Carver, Inc., 54 River Rd., Summit, N . J. 67A-1 Proportional Counter Converters. Catalog available that includes informa tion on the new NMC proportional counter converter that converts any scaler to a proportional counter. Unit has a build-in power supply. Nuclear Measurements Corp., 2460 N. Arlington Ave., Indianapolis 18, Indiana. 7 3 A - 3 Radiation Analysers. Full details available on company's new radiation analyzer which, connected directly to a scaler and scintillation counter, incor porates in a compact single-chassis de sign a non-overloading linear amplifier, pulse height disci iminator, and stable
high voltage regulator. Nuclear Instru ment & Chemical Corp., 251 W. Erie St., Chicago 10, III. 18A Recorders, Graphic. Complete tech nical data available on the Varian G-10 graphic recorder. Unit weighs 15 pounds, measures 10" X 7Vs" X 8" and is portable. Used as recording millivoltmeter or (with appropriate trans ducers) to record measurement of physi cal quantities. Varian Associates, Palo Alto 4, Calif. 14A Sink Traps, Polyethylene. Complete details available on Nalgene polyethyl ene sink traps that resist all chemicals normally flushed down the sink includ ing mercury. Three inch deep catch-pot base. Fits all sinks. The Nalge Co., Inc., Rochester 2, Ν. Υ. 71Α-1 Spectrometers, Nuclear Magnetic. Circle 43A for complete information on the Varian high resolution nuclear mag netic resonance spectrometer now avail able with the new "super-stabilizer." Used in the study of molecular struc tures and chemical systems. Varian Associates. Palo Alto 4, Calif. 43A Spectrophotometers. Company's spectrophotometer can now be equipped
GLASS ABSORPTION CELLS OF FINE QUALITY MADE BY
KLETT
Complete Electrophoresis Apparatus SCIENTIFIC APPARATUS Klett-Summerson Photoelectric Colorimeters Calorimeters - Nephelometers - Fluorimeters Bio-Calorimeters - Comparators - Glass Stand ards - Glass Cell - Klett Reagents
KLETT
M A N U F A C T U R I N G CO. 177 E A S T 87TH STREET Ν EW YO R Κ Ν. Υ.
For further information, circle nun lier 56 A on Readers' Service Card, page SI A
56 A
ANALYTICAL
CHEMISTRY"
with a mechanism which allows direct recording of linear absorbance over the range 0 to 1.0 absorbance unit (circle 36A-2 for complete information). Also available is information on the P-E Model 21 double beam infrared spec trophotometer (circle 36A-3). PerkinElmer Corp., 800 Main Ave., Norwalk, Conn. 36A-2,3
MEASURE MOLECULAR WEIGHT AND PARTICLE SIZE
Spectrophotometers. Detailed litera ture available on the Zeiss spectro photometer. The spectral region ranges from near infrared (1,000 ταμ) to farultraviolet (200 ηΐμ). Operates on 110-volt A.C. Carl Zeiss, Inc., 485 Fifth Ave., Ν . Υ. 17. 11A Spectrophotometers. Bulletin avail able on unit with no "printed circuits" or unstable vacuum tube electronics, since "gadgetry" in laboratory instru mentation is undesirable, company states. Coleman Instruments, 318 Madison St., Maywood, 111. 31A Spectrophotometers,
NEW BRICE PHOENIX UNIVERSAL LIGHT SCATTERING PHOTOMETER Measures: 1. Absolute Turbidity 2. Dissymmetry 3. Depolarization
Recording.
Complete details available on the Beckman DK recording spectrophotometer that now offers extended spectral-range (185 to 3,500 πΐμ), linear absorbance and wavelength. Harshaw Scientific, 1945 E. 97 St., Cleveland 6, Ohio. 6A
This instrument is listed in U.S. Government specifi cations for the evaluation of certain clinical materials.
PHOENIX PRECISION INSTRUMENT COMPANY 3805 N . 5th St.
Spectrophotometers,
Recording.
Accurate, direct reading absorbance to I860 A is now provided with the Model 14 through the use of optical elements of increased ultraviolet efficiency in the double monochromator. Bulletin avail able. Applied Physics Corp., 362 W. Colorado St., Pasadena 1, Calif.
Philadelphia 4 0 , Pa.
For further information, circle number 57 A-1 on Readers' Seivice Card, page 61 A
46A-1 Spectrophotometers,
Recording.
Data file available on the Beckman IR-4 spectrophotometer that may be oper ated double- or single-beam. Doublemonochromator design provides twice the dispersion and energy of comparable single monochromators, company states. Beckman Instruments, Inc., Scientific Instruments, Fullerton, Calif. 52A Stirrers, Variable Speed. Full infor mation available on Cenco high torque stirrers that are cited as providing: precise control of speed from 100 to 1300 rpm without reducing stirring effective ness, power for stirring extremely vis cous liquids, finger tip speed adjustment and stainless steel parts. Central Scientific Co., 1708 Irving Park Rd., Chicago 13, 111. 17A Stirring Apparatus, Magnetic. Bul letin available on compact, quiet-run ning apparatus which utilizes a rotating field of magnetic force to induce variable speed stirring action within either closed or open vessels. Stirring bars sealed in
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new model
.~j
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represent the greatest advance in trip balance construction in many years. In addition to other fine features is the ι U N D I V I D E D TARE BEAM a n d ROISE 1 which makes possible direct reading of net value 1 thereby greatly increasing the utility of these fine Β new balances.
j J I • •
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•
for complete information write for brochure
T A R E C A P A C I T Y : ÎBO G R A M
OHAUS
SCALE
CORPORATION
IOSO COMMERCE AVE. UNION, NEW JXKSEY
(Continued on page 58 A) For farther information, circle number 5T A-2 on Readers' Service Card, page 61 A
V O L U M E 28, N O . 4, A P R I L
1956
57 A
Product Capsules Pyrex brand glass, Kel-F or Teflon. Arthur Ii. Thomas Co., P. 0 . Box 779, Phila. 5, Pa. 38A Stopcock Tension Clip. Company of fers a free sample of its self-locking stop cock tension clip that prevents plugs from falling out or leaking under either pressure or vacuum. Circle 13A-1 for free sample. Todd Scientific Co., Springfield, Pa. 13A-1 Titrators. Company states that an im proved Fischer reagent makes the Waco titrator more accurate and versatile. New spherical joint glassware is now provided. Circle 4A for more informa tion. Wilkens-Anderson Co., 4525 TV. Division St., Chicago 51, 111. 4A Titrators, Automatic. Full informa tion available on company's automatic electrometric titration apparatus using second derivative method of H. V. Malmstadt. For use in all titrations usually classified as potentiometric. Push-button start, automatic shutoff. Catalog also available. Ε. Η. Sargent & Co., 4647 TV. Foster Ave., Chicago 30, 111. 39A Titrators, Automatic. Bulletin avail able on the Fisher coulomatic titrimeter that is cited as automatically, quickly,
and easily determining mercaptans, halides and thiocyanates to ± 1 % accu racy. Fisher Scientific Co., 100 Fisher Bldg., Pittsburgh IS, Pa. 44A Tubing, Plastic. Sample available of neutral, flexible, transparent plastic tubing that is chemically resistant; acid and alkali resistant; and non-oxidizing. The Nalge Co., Inc. Rochester 2, Ν. Υ. 12A-2 Tubing, Plastic. Tygon clear flexible plastic tubingjs cited as being non-toxic and non-contaminating. Smooth and seamless. Easy io handle. U. S. Stoneware, Akron 9, Ohio. 64A Tubing, Rubber. Information avail able on pure late:; laboratory tubing that is cited as being safe and non-toxic. Has a tensile strength in excess of 4,000 lbs. per sq. in. Available in 24 standard sizes. Rubber Latex Products, Inc., Cuyahoga Falls, Ohio. 66A Vitreous Silicawaie. Bulletin avail able providing specifications and prices on vitreosil tubing. Tubing is catalytically inert. Useful up to 1000° C and under extreme thermal shock. Thermal Americar Fused Quartz Co., Inc., 18-20 Salem St., Dover, N . J. 33A
made to measure Every item in the Diamond D Blue Line will measure with maxi mum accuracy and uniformity. The graduations are calibrated with ex treme care and the etching is deep and clear to afford maximum read ability. The pigment in the Diamond D Blue Line is heat-fused into the graduations and is impervious to practically every chemical. The Diamond D Blue Line is annealed in electrically-con trolled lehrs to relieve internal strain and each piece is double tested to rigid standards. When you need laboratory glassware with built-in accuracy and uni formity, specify the Diamond D Blue Line. Send for FREE brochure today.
Voltage Regulators. Bulletin avail able providing full details on stabiline automatic voltage regulators that are cited as providing constant input volt age regardless of line or load changes. The Superior Electric Co., 1003 Middle St., Bristol, Conn. 41A
CHEMICALS AND MATERIALS Acids. Circle indicated numbers for complete information on the following Baker & Adamson "O.P." acids: sul furic acid, 4-1 Cover; hydrochloric acid, 4-2 Cover; acetic acid, 4-3 Cover; and ammonium hydroxide, 4-4 Cover. All four are available in no deposit "single trip" shipping cases with non-return able bottles. General Chemical Div., Allied Chemical & Dye Corp., 40 Rector St., New York 6. 4-1,2,3,4 Cover Detergents. Full details available on "Alconox" for hand washing operations and "Alcojet" for machine washing operations. Alconox, Inc., 61-63 Cornelison Ave., Jersey City 4, N . J. 16A
Viscosity directly in centipoises . . HOEPPLER VISCOSIMETER PRECISION MODEL
The Hoeppler Viscosimeter pro vides a fast, accurate method of de termining the viscosity of gases, liquids, oils, plastics, syrups, viscous tars and dark liquids. From 0°C. to 100°C. Direct readings in centipoises (or centistokes). From 0.01 to 1,000,000 centipoises. Accuracy 0.1% to 0.5%. Small sample C30cc) required. Results consistent and reproducible. Write tor Bulletin
HV-303.
FALLING BALL PRINCIPLE
The falling time of the ball multiplied by other given factors shows absolute viscosity in centipoises.
UBBELOHDE Viscosimeter on the principle of the suspended level A capillary-type viscosimeter for determining the kinematic viscosity of any true viscous liquid, such as petroleum products or lubricants. See American Society for Testing Materials, A.S.T.M. designation D 445-46T. Measures viscosity with an error not greater than ± 0 . 1 % , when used at efflux times of 80-1000 seconds. The smallest listed capillary is used for light fuel oil o r kerosene, the others for lubricating oils. The temperature of the bath should be controlled within ± 0 . 0 2 °F. In all capillary sizes as called for by the A.S.T.M.—calibrated or uncalibrated. Uncalibrated capillary, $18. Calibrated, S37.50 Metal frame tofitcapillary, $6. Bulletin UV349
will be sent on request
Order direct or from leading laboratory
D
DOERR GLASS COMPANY VINELAND, N. J.
Circle No. 58 A-1 on Readers' Service Card, page 61 A
58 A
FISH-SCHURMAN CORPORATION 72 Foreman Road, N e w Rochelle, Ν . Υ.
supply dealers.
W ^ V ΐ7^>ί'
Fish-Schurman Circle No. 58 A-2 on Readers' Service Card, page 61 A
ANALYTICAL·CHEMISTRY
Laboratory Chemicals. Circle indicated numbers for the following Merck laboratory chemicals: dimethylformamide, 57A-1; trichloroacetic, 57A-2; osmium tetroxide, 57A-3; and methylene chloride (spectrograde), 57A-4. Merck & Co., Inc., Rahway, N. J. 57A-1 to 4 Radioactive Compounds. Radioactive compounds make detection as low as parts per billion easy, company states. New catalog with complete listings of compounds and nuclear instruments available. Tracerlab, Inc., 130 High St., Boston 10, Mass. 50A-3 Reagents. New 1956 Mallinckrodt AR catalog available. Provides a complete listing of over 400 AR chemicals and many other chemicals useful in the laboratory. Mallinckrodt Chemical Wks., 2nd and Mallinckrodt Sts., St. Louis 7, Mo. 19A Reagents. 5-pint du Pont C.P. reagents are now packaged in single-trip, throwaway bottles and cases. Bottles feature new dripless sleeve and color coding. E. I. du Pont de Nemours & Co., Inc., Grasselli Chemicals Dept., Wilmington 98, Del. 49A Reagents. Every "Baker Analyzed" reagent carries the actual lot analysis on the label, and many carry a lot assay. Company's reagents are also cited as being quickly available in safe, functional containers. J. T. Baker Chemical Co., Phillipsburg, N. J. 2-2 Cover
If you need a hydraulic bench press for any purpose in thefieldof rubber moulding, plastic, laboratory testing or graphic arts, write for circular or if you piefer ive'll have our nearest representative call on you...
PHI PRESS
formerly Preco
Pasadena Hydraulics, Inc., 275North Hill Ave.,Pasadena, Calif. For further information, circle number SS A-1 on Readers' Service Card, page 61 A
) !0.5.:6 7 ;
For precision pressure measurement
Valuable information is easy to get!
CEC's 3 7 - 1 0 3
Electromanometer
See page 61 A for instructions on how to use our free Readers' Information Service
CHECK T H E S E F E A T U R E S . . . • fast response (4 sec. full-scale) • rugged, compact, portable • two readouts: visual digital and electrical analog (10 volts f.s.) • negligible temperature effect • remote operation
;i/:-''!;ir:'v,;;v;':r---y;XJ
For speed and accuracy in pressure measurements, investigate CEC's 37-103 Elect r o m a n o m e t e r . It equals manometer-tube accuracy (0.05% of full scale) . . . eliminates interpolation errors by reading out in direct numerical form. For complete details on this rugged industrial tool, send today for Bulletin CEC 1547-X17.
• maintenance-free • interchangeable pressure heads in 5, 15, 60 and 150 psi ranges for gage, differential, or absolute pressures ALSO AVAILABLE • special, highspeed system with extra-high resolution. Response time of 0.1 sec. full-scale.
Consolidated Electrodynamics CORPORATION
formerly Consolidated Engineering Corporation ELECTRONIC I N S T R U M E N T S FOR M E A S U R E M E N T A N D CONTROL 300 North Sierra Madre Villa, Pasadena, California , For further information, circle number 59 A-2 on Readers' Service Card, page 61 A
V O L U M E 2 8 , N O . 4, A P R I L 1 9 5 6
59 A
