PRODUCT CAPSULES For your convenience — short "refreshers" on last month's ads. Follow directions on page 7 9 A to ob tain free information on products and services described
EQUIPMENT AND MATERIALS In both the laboratory and in fhe quality control of production the latest in formation on equipment and instru ments is a must for companies and technologists interested in improving accuracy, lowering costs, and in re ducing operating time. To keep abreast of new techniques and products, simply follow directions on page 79 A to obtain free information on the items de scribed in this section.
Analyzers, Gas. Application litera ture available on analyzers that con tinuously analyze and simultaneously record on one chart from one to six constituents of a gas. Cambridge In strument Co., Inc., 3514 Grand Central Terminal, N. Y. 17, Ν. Υ. 65Α-1 Balances. Folder available on indus trial balance with new micrometer rotating poise that enables weighing from 0.5 to 1000 gram without addi tional weights. Capacity, 5 Kg. Sensi tivity, 0.5 Gm. Ohaus Scale Corp., 1050 Commerce Ave., Union, N. J. 29A-2 Balances. Complete file available on modern Mettler balances. Mettler In strument Corp., Hightstown, N. J. 52A Balances. 4-page bulletin available on the improved Ainsworth "Right-aWeigh" analytical balance. Weights operated by knobs and totalled on eyelevel counters. Wm. Ainsworth & Sons, Inc., 2151 Lawrence St., Denver 5, Colo. 86A
16" uninsulated Pyrex jar. WilkensAnderson Co., 4525 W. Division St., Chicago 51, 111. 4A Blenders. Catalog available on twinshell blenders, cited as providing scaleup of lab tests to production runs. Dust-tight, corrosion and abrasion résistent lucite shells are standard. The Patterson-Kelley Co., Inc., 2400 Hanson St., E. Stroudsburg, Pa. 54A-2 Burettes. "Custom-Made Laboratory Glassware" catalog available. Contains information on 5 automatic burettes with precision bore tubing. Corning Glass Works, 69-10 Crystal St., Corning, Ν. Υ. 31A Burettes. Complete information avail able on the "Ultramax" buret that is accurate with 0.05 ml. Features pre cision-bore tubing and teflon plug. 3 models in 5 sizes. All parts are re placeable and interchangeable. Fischer and Porter Co., 1066 County Line Rd., Hatboro, Pa. 58A-1 Burettes & Centrifuge Tubes. Com pany's micro-burettes deliver drops as fine as .01 ml. with the detachable platinum alloy delivery tip (circle 3-1 cover). The graduated centrifuge tubes are made from tubing having heavy, even walls. Tops have machine tooled reinforcing bead. Circle 3-2 cover. Kimble Glass Co., Toledo 1, Ohio 3-1. 2 Cover. 3-1, 2 Cover Calorimeters. Information available on company's instruments that deter mine the heat of combustion of solid or
Balances, Triple-Beam. Full details available on stainless steel triple-beam balance with 3 graduated scale levels, cobalite knife edges, and grooved agate bearings. Capacity: 111 g. (201 g. using auxiliary weight). Sensitive to 0.01 g. or less. W. M. Welch Scientific Co., 1515 Sedgwick St., Chicago 10, 111. 72A
Cells, Glass Absorption. Circle 45A-3 for complete information on Klett glass absorption cells. Klett Manufacturing Co., 177 East 87th St., Ν. Υ. 45Α-3 Centrifuges. Information available on company's heavy-duty centrifuge for ordinary applications where very high speeds are not essential. Speed: 1200 to 4500 r.p.m.; 290 to 3200 G. Capac ity: 15, 50, 100 ml. tubes; 250 ml. bottles ; 3 liter baskets. 39" high X 20" wide X 23" deep. International Equip ment Co., 1284 Soldiers Field Rd., Boston 35, Mass. 48A Centrifuges. Bulletin available on company's superspeed angle centrifuges. 15,500-r.p.m. 31,000 X G. 400-ml. Ivan Sorvall, Inc., P. O. Box 230, Norwalk, Conn. 12A-2 Chromatography Catalog. Circle 6A for chromatography and electrophoresis apparatus catalog that includes in formation on balances, cabinets, chemi cals, colorimeters, densitometers, desalters, drying ovens, filter papers, flasks, fraction collectors, jar set-ups, spectrophotometers, and many other items. Harshaw Scientific, Div. of The Harshaw Chemical Co., Cleveland 6, Ohio. 6A (Continued on page 72 A)
Surveys a n d comments have 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 pages as v a l u a b l e sources of 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 pages. To increase further the value of these advertisements to readers, 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.
Baths, Refrigerated. Bulletin avail able on visibility bath with both me chanical refrigeration and heating. Pro vides constant temperature from —10° C. to + 6 5 ° C. using 10" of liquid in a V O L U M E 2 8, NO. 1 1 , N O V E M B E R
liquid fuels. All models have electric motor driven stirrers, thermometers and all accessories for testing. Parr In strument Co., Moline, 111. 85A
1956
71A
for every need... Carbon Determinator Determines carbon contents to fourth decimal in 5-10 minutes! Ideal for transformer sheet, Alnico, titanium, stainless steel, ferrochromium, ferrosilicon, ferroboron, ingot iron, nickel, molybdenum and many others.
Product Capsules C h r o m a t o g r a p h y Cells. D a t a sheets available on company's gas chromatog r a p h y cells for hot operation (225° C ) . Gow-Mac I n s t r u m e n t Co., 100 Kings Rd., Madison, N . J. 40A-2 Collectors, Fraction. 4-page illus trated bulletin available on company's automatic fraction collectors for column chromatography. Time, drop counting and special types. Drops from the column fall directly into the test tubes. Packard Instrument Co., P.O. Box 428, La Grange, 111. 23A Collectors, Fraction. Information available on the new " R a d i R a c " auto matic fraction collectors for t h e collec tion of effluents by the timed flow, volumetric, and drop count methods. Collects in radii, circles, spirals. L K B Produkter Fabriksaktiebolag, P. 0 . Box 120 35-Stockholm 12, Sweden.
28A-3 Leco gaseometric carbon determinators available in seven manual or semi-automatic models. Use on carbon or alloy steel, cast iron, tungsten carbide, chrome carbide, tantalum carbide and titanium carbide. Semi-Automatic Carbon Determinator
C o m b u s t i o n Tubes. Company's "Volcanus" combustion tubes are de signed for high temperature service (2900° R ) . Sizes: 1" o.d. to l 6 / 8 " o.d. Lengths to 36 inches, plain and constricted end. Coors Porcelain Co., Golden, Colo. 61A-2
Leco Carbon Determinator for measurement of carbon in cracking catalyst. Partic ularly adapted to the requirements of the oil industry. Carbon Determinator for Cracking Catalyst
> If you follow the gravimetric method, here is the fastest, most efficient apparatus on the market. Employs only solid absorbents and a short train, with a small volume to sweep.
Carbon Train
Write Today for Complete Technical and Descriptive Data!
LABORATORY EQUIPMENT CORP. St. J o s e p h
8,
Michigan
Circle No. 72 A on Readers' Service Card, page 79 A
72 A
Colorimeters. 64-page manual, "Coleman Tools for Science," avail able. Includes information on filter instrument with wide choice of sample sizes: 9 cuvette sizes and types; sample volumes from 10 ml. to .007 ml. Optical density and % transmittance from either galvanometer or potentiometer scales. Coleman Instruments, Inc., Maywood, 111. 79A-2
Densitometers. Bulletin available on densitometer for partition chromatog raphy and paper electrophoresis. Photovolt Corp., 95 Madison Ave., N. Y. 16, Ν . Υ. 75Α-2 Electrodeposition A p p a r a t u s . Bulle tin available t h a t details company's a p p a r a t u s for analysis b y electrodeposition and outlines t h e application and advantages of each type. Com pany's polarographic analyzer operates in the range of 0.01 to 0.000001 equiva lents per liter. Fisher Scientific Co., 100 Fisher Bldg., Pittsburgh 19, Pa.
77A Electromanometers. Bulletin avail able on company's all-electronic electromanometers in multi-channel form. I n s t r u m e n t measures up t o 6 pressure channels sequentially with one servoamplifier. Consolidiated Electro dynamics Corp., 300 N . Sierra M a d r e Villa, Pasadena, Calif. 59A Electrometers. Bulletin available dynamic capacitor electrometer stable amplification of low-level signals. Measures currents as low
on for dc as
10 16 a m p . I n p u t impedance: 10 15 ohms. Accuracy: ' / 2 % full scale. 14" X 10" X 9". " Curtiss-Wright Corp., Electronics Div., Carlstadt, N . J. 6 0 A Electron T u b e s . Technical d a t a avail able on 5" direct-view display storage tubes t h a t present displays of electronic information for as long as 60 seconds after writing stops. Brightness: 1750 foot-lamberts. Writing speed : 300,000 inches/sec. Radio Corp. of America, Harrison, N . J. 46A Electrophoresis A p p a r a t u s . Bulletin available on a complete apparatus for paper strips and starch blocks. Uses Vs" and 1" widths of paper strips. Separates 10 ml. samples b y starch technique. Laboratory Glass & Instru ment Corp., 514 West 147th St., Ν . Υ. 31, Ν. Υ. 67Α-1 Extractors. Bulletin available on the new " R i n c o " extractor t h a t uses a rotating sphere. Solvent is continually and automatically bled off, distilled, condensed and re-introduced. Aqueous phase capacity is 4000 ml.; solvent phase 700 to 800 ml. Aloe Scientific, Div. of A. S. Aloe Co., 5655 Kingsburv. St. Louis 12, Mo. 40A-1 Fluorimeters. Bulletin availableonlineoperated multiplier fluorescence meters possessing high-sensitivity for measure ment of low concentrations. Photovolt Corp., 95 Madison Ave., Ν . Υ. 15. NY. 75A-13 Fluorimeters. Klett fluorimeters are cited as being designed for the accurate and rapid determination of thiamin, riboflavin, and other substances which fluoresce in solution. Klett M a n u facturing Co., 179 E a s t 87th St., Ν . Υ., Ν. Υ. 69Α-3 Fluorimeters. Descriptive bulletin available on company's G-M fluorimetcr t h a t analyzes uranium in any form in concentrations of 0.001% and less. Features include no cooling system, no optical system, improved power source, and convenient control grouping. Jarrell-Ash Co., 28 Farwell St., Xewtonville, Mass. 83A-2 Freeze-Drying A p p a r a t u s . Descrip tive folder available on company's complete line of freeze-drying apparatus. Line includes t h e bio-dryer, the histo logical freeze-dryer, the micro unit, the macro unit, the super unit, the allglass modified Campbell-Pressman unit, and t h e freeze-mobile. E. Machlett & Son, 220 East 23rd St., N . Y. 10, Ν . Υ.
55A Furnaces. Bulletin available on com bustion tube furnace for temperatures to 2600° F . 12" chamber. All the temperature control and indicating ANALYTICAL
CHEMISTRY
Product Capsules
Regulation in less than Vsoth cyc/e···
devices are located in the furnace base. Ilevi-Duty Electric Co., Milwaukee 1, Wis. " 35A-2 Furnaces. Bulletin available on tube type laboratory furnace used for an nealing, brazing, heat treatment, hard ening, sintering, reducing metal pow ders, silver soldering, and nitriding. Lindberg Engineering Co., Laboratory Equipment Div., 2440 W. Hubbard St., Chicago 12, 111. 68A-1 Generators. Bulletin available on low CFH generator that produces dissoci ated ammonia atmosphere for use in laboratory furnaces and small produc tion runs. Lindberg Engineering Co., Laboratory Equipment Div., 2440 W. Hubbard St., Chicago 12, 111. 12A-1 Glass Tubing Cribs. Bulletin avail able on new Bethlehem seal-crib for all standard sizes and lengths of glass tubing. Features filter-seal door and divided compartments. Bethlehem Apparatus Co., Inc., Hellertown, Pa. 16A-1
Glass-Tubing Cutter. New hot-wiretype unit cuts glass tubing bottles or jars up to 3 inches in diameter. 6" X 4 1 // X 9". Operates on 115 volts, 50 or 60 cycle a.c. W. M. Welch Scientific Co., 1515 Sedgwick St., Chicago 10, 111. 35A-1
Output of Curtiss-Wrighi Distortion Eliminating Voltage Regulator from same i n p u t . Full r e c o v e r y in 3 3 0 microsec. Simultaneous two-pen recording of 60 c.p.s. voltage
PLUSPure Sine Wave Power CURTISS-WRIGHT LINE REGULATOR
Glassware, Calibrated. Brochure available on the Diamond D Blue Line of laboratory glassware. The pigment is heat-fused into the gradua tions and is impervious to almost every chemical. Doerr Glass Co., Vineland, N. J. 65A-2 Hot Plates & Stirrers. Information available on company's combination magnetic stirrer and hot plate that stirs or heats separately or together. Temperatures to 700° F. Vis hp motor. Will Corp., Rochester 3, Ν. Υ. 29 A-1
Kjeldahl Apparatus. Complete de tails available on the following Labconco Kjeldahl units for protein determination : acid and caustic dispensing units, standard Kjeldahl apparatus, Kjeldahl sink, and company's titration unit. Laboratory Construction Co., 1108 Holmes, Kansas City, Mo. 10A
•
Electronically regulates r.m.s. and peak voltage si· multaneously to ± 1 %.
•
Reduces typical power line distortion to less than 0.3%.
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Furnishes 1.4 KVA of distortion-free power.
•
Introduces no phase shift between input and output.
•
Simultaneously provides additional 4 KVA of ± 1 % electromechanically regulated power.
pler, more accurate calibration of meters . . . better design of trans formers, synchros, motors . . . easier testing of such components, with fewer rejects . . . easier, more accurate measurement of magnetic properties and receiver sensitivity . . . better a.c. com puter performance . . . elimination of fast line transient effects. Write for details.
Faster recovery time (less than % 0 th cycle, or 330 microsec onds) plus the unique ability to eliminate line distortion — these are the reasons why the CurtissWright Distortion Eliminating Voltage Regulator has been chosen by more and more laboratories and production test departments. Besides general laboratory use, this line regulator provides sim
Laboratory Apparatus. Circle 30A-2 for catalog on company's scientific instruments and apparatus. Catalog includes information on weighing funnels, polyethylene wash bottles, and filter bells. New York Laboratory Supply Co., Inc., 76 Varick St., Ν. Υ. 13, Ν. Υ. 30Α-2 (Continued on page 74 A) V O L U M E 2 8, NO. 11, N O V E M B E R 1 9 5 6
Electronic Component & Instrument Sales Department
CS
D I V I S I O N
CURTISS-WRIGHT CORPORATION
·
CARLSTAOT,
N.
J.
For further information, circle number 73 A on Readers' Service Card, page 79 A
73 A
Product Capsules Laboratory Equipment. Circle indi cated numbers for complete information on the following: electronic relays, 42A-1; P-type polyethylene sink trap, 42A-2; "Reyers-Rapid" bulk weighing balance, 42A-3; and "Reyers-Progress" analytical balance, 42A-4. Arthur S. LaPine and Co., 6001 S. Knox Ave., Chicago 29, 111. 42A-1 to 4 Laboratory Instruments. Circle in dicated numbers for complete informa tion on the following instruments for high vacuum operations: vacuum gauges, 18A-1; water-cooled oil diffu sion pump, 18A-2; and "Teflon" constructed laboratory gland, 18A-3. Arthur Γ. Smith Co., 311 Alexander St., Rochester 4, Ν. Υ. 18A-1, 2, 3 Laboratory Instruments. Bulletin available that provides complete de scriptions, including sample curves, of the following instruments for analytical research and process stream control: recording spectrophotometers, Raman spectrophotometers, electrometers, in frared analyzers, and ultraviolet an alyzers. Applied Physics Corp., 362 W. Colorado St., Pasadena 1, Calif. 44A
Microscopes, Polarizing. Detailed specifications available on the Carl Zeiss polarizing microscope. For re search and laboratory requirements in both binocular and monocular types, featuring the inclined-tube system. Carl Zeiss, Inc., 485 Fifth Ave., Ν. Υ. 17, N Y . 61A-3 Mixers, Laboratory. Information available on company's new electronic controlled lab mixer that provides variable speeds at full dc torque from ac lines. Gerald K. Heller Co., 3 N. Carey St., Bait. 23, Md. 40A-3 Nuclear Instruments. Catalog avail able that details company's nuclear instruments. Line includes propor tional counting system and converter. Nuclear Measurements Corp., 2460 N. Arlington Ave., Indianapolis 18, Ind. 16A-2 pH Meters. Bulletin available on company's complete line of battery and line-operated pH meters incorpora ting modern electronic tubes and cir cuits. Simple in operation and main tenance, featuring sealed amplifier plugin units. Photovolt Corp., 95 Madison Ave., N. Y. 16, Ν. Υ. 75Α-1
Laboratory Instruments. Circle in dicated numbers for complete informa tion on the following items: vapor fractometers, 36A-1 ; double beam infra red spectrophotometers, 36A-2; infra red spectrophotometry report (on the use of infrared for counting molecules), 36A-3; and the quarterly publication "Instrument News," 36A-4. PerkinElmer Corp., 800 Main Ave., Norwalk, Conn. 36A-1 to 4
Photometers. Complete information available on company's Brice-Phoenix new light-scattering photometer that measures molecular weights and par ticle sizes. Circle 67A-3. Also avail able is information on differential refractometers, (67A-4), ratio recorders (67A-5), and absorption cells (67A-6). Phoenix Precision Instrument Co., 3805 N. 5th St., Phila. 40, Pa. 67A-3 to 6
Melting Point Apparatus. Detailed information available on the Kofler micro hot stage, a melting point appa ratus for control testing. Electrically heated, with stage calibrated thermom eters. Arthur H. Thomas Co., Box 779, Philadelphia 5, Pa. 74A-1
Photo-Nephelometers. The Coleman Nephelos Standards used with a Cole man nephelometer provide an accurate numerical notation system, company states. Haze data can be expressed on a fixed, numerical scale to set standards or reproduce procedures. Complete data available. Coleman Instruments, Inc., 318 Madison St., Maywood, 111. 11A
Microburets and Pipets. Dial gauges on all styles and models of the Gilmont ultra-microburets and pipets have been replaced with a new mechanical counting device that is more convenient and permits greater precision of measure ment. Manostat Corp., 20-26 N. Moore St., N. Y. 13, Ν. Υ. 47Α-1 Micro-Microammeters. Folder avail able on instrument suited to almost all low-current measurements, including currents in photocells, vacuum tube grids, semi-conductors, and ion cham bers. Measures currents over 10 dec ades on 20 ranges. Accurate within ± 3 % . Keithley Instruments, Inc., 12415 Euclid Ave., Cleveland 6, Ohio. 3 0 A-1 74 A
Phototubes, Multiplier. Company's 10 stage 3 / 4 " multiplier phototube is cited as having the ruggedness of field equipment combined with the perform ance of a laboratory tube. Average gain is 300,000 at 105 volts/stage. Linear box-type dynode structure is used. Allen B. Du Mont Laboratories, Inc., 2 Main Ave., Clifton, N. J. 25A Platinumware. Information avail able on company's complete line of products that include bimetals, elec trodes, foil, laboratory apparatus, pre cious metal catalysts, Noble metal salts & solutions, tubing, and wire. J. Bishop & Co., Platinum Works, Malvern, Pa. 64A-1
Platinumware. Information available on company's new weighing cup and combustion boat made of platinumrhodium and new forceps with heavy duty platinum tips. The American Platinum Works, 231 New Jersey R.R. Ave., Newark 5, N. J. 69A-1 Polarographs. Catalog available. Includes information on company's manual, indicating polarograph foiroutine analysis where only one sub stance is determined and where the step shape approximates a pure form. E. H. Sargent & Co., 4647 W. Foster Ave., Chicago 30, 111. 39A Pollution
Control
Instruments.
Circle 81A-1 for bulletin on company's Universal Anemometer that reads wind velocity in kilometers per hour, miles per hour, or knots. Also available are bulletins on company's water current meters (circle 81A-2), and water level recorders (circle 81A-3). W. & L. E. Gurley, 523 Fulton St., Troy, Ν. Υ. 81A-1,2,3 Presses, Hydraulic. Bulletin avail able on press used for making KBr pellets for infrared spectroscope anal ysis. 20-ton capacity. Bench mounted, hand operated. Loomis Engineering & Manufacturing Co., 133 So. 14th St., Newark 7, N. J. 8A Presses, Hydraulic. Catalog avail able on Carver laboratory presses. Unit is used for forming KBr pellets, dehydrating, 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. 82A Pumps & Stirrers. Company's midget pumps and laboratory stirrers are available in a variety of powers, capaci ties and specifications. Circle 45A-1 for midget pump and 45A-2 for labora tory stirrer bulletins that provide performance charts, standard models and prices. Eastern Industries, Inc., 100 Skiff St., Hamden 14, Conn. 45 A - 1 , 2 Pumps. Catalog available on pumps that use steel fingers in sequence to force liquid through tubing. Pumps liquids, gases, and slurries without corrosion or contamination. Sigmamotor, Inc., 500 Vernon St., Middleport, Ν. Υ. 67Α-2 Pumps, Vacuum. Circular available on high vacuum pumps for laboratory or industrial use. Delivers 57 liters of free air displacement at 600 rpm with Va hp motor. 17V2" Χ 1 0 1 / / X 14V2". Central Scientific Co., 1708 Irving Park Rd., Chicago 13, 111. 14A {Continued on -page 76 A) ANALYTICAL
CHEMISTRY
Product Capsules Scanners. Catalog available on new automatic scanner for gamma-ray spec trum analysis. Repetitive scanning without attention. Five gear ratios Vs to 2 rpm. Detectolab, Inc., 6548 N. Sheridan Rd., Chicago 26, 111. 61A-2 Spectrographic Equipment. Com plete information available on com pany's "Autrometer," a fully automatic multi-indexing x-ray spectrograph, de livering printed qualitative and quanti tative data on as many as twenty-four elements in a single sample. Unit provides rapid, accurate production quality control. North American Philips Co., Inc., 750 So. Fulton Ave., Alt. Vernon, Ν. Υ. 63Α Spectrometers, N-M-R. Information available on company's high resolution nuclear magnetic resonance spectrom eter now with a new "super stabilizer." Applications include quantitative and qualitative analysis of functional groups, hydrogen bonding studies, following molecular rearrangements, structural studies of natural products. Varian Assoc, Palo Alto 4, Calif. 17 A Spectrophotometers. Complete de tails available on the "Spectracord 4000" recording ultraviolet spectro photometer with a double monochromator. Unit is a precise, accurate ultraviolet, visible and near infrared scanning system providing linear transmittance and linear absorbance. PerkinElmer Corp., 800 Main Ave., Norwalk, Conn. 37A Spectrophotometers. File available on the Beckman DK automatic record ing spectrophotometer. 5 new acces sories enables 6 new uses: reaction rate studies, repeat scans, linear wavelength recording, flame emission recording, lower ultraviolet studies, and special near-infrared studies. Beckman Instru ments, Inc., Fullerton, Calif. 57A-1 Spectrophotometers. Details avail able on the P&I automatic recording spectrophotometer that is cited as con verting the manual Beckman DU to a more sensitive line operated automatic recording instrument. Process & Instruments, 15 Stone Ave., Brooklvn 33, N . Y . 28A-1 Spectroscopic Electrode. Complete information available on the new "Spectro-Tech" spectrographic graphite designed to fill the requirements of a good serviceable grade of graphite at an economical price. Uniformity assures consistent reproducibility in routine metallurgical techniques. Available in one-foot lengths of VV', Vis" and 1/4" 76 A
diameters. United Carbon Products Co., Inc., Box 269, Bav City, Mich. 33A Stirrers. Bulletin available on com pany's "Power-Stir", a high-torque, variable speed stirrer designed for intermittent medium duty. Electric governor maintains speed. Has hollow spindle. 200 to 1000 rpm. Eberbach Corp., Ann Arbor, Mich. 65A-3 Stirrers. Complete information avail able on company's explosion proof laboratory stirrers powered by air and used for stirring all types of solvents, laquers, paints, oils, synthetics, fine and heavy chemicals where danger of explosion may exist. Arrow Engineer ing Co., Inc.', 200 Central Ave., Hill side, N. J. 83A-1 Stopcocks. "Laboratory Glassware" bulletin available. Describes leak proof, interchangeable Pyrex stopcocks equipped with a metal spring. Obtain able in a wide range of types, shapes, and sizes. Corning Glass Works, Corn ing, Ν. Υ. 50Α Sulfur Titrators. Catalog available on company's automatic sulfur titrator with induction furnace. Used to an alyze sulfur in iron, steel, oil, coal, coke, ores, catalysts, and rubber. Laboratory Equipment Corp., St. Joseph 8, Mich. 58A-3 Thermometers, Electronic Resist ance. Bulletin available on thermom eters which covers a range from —100° C. to 900° C. with .01° sensitivity and digital reading of temperature directly. The Emil Greiner Co., 20-26 N. Moore St., N . Y . 13, N . Y . 34A Traps, Vacuum. Complete informa tion available on company's vacuum traps used for freezing out undesired vapors in the vacuum ' system. Also can be used in connection with Dewar flasks. Ace Glass Inc., Vineland, N. J. 80A Tubing, Plastic. Tygon flexible plastic tubing is cited as being chemically resistant, non-toxic, non-contaminating, seamless, glass-clear, easy to couple and uncouple. U. S. Stoneware, Akron 9, Ohio. 78A Ultracentrifuges. Complete details available on company's analytical ultracentrifuge used for the purification and molecular-weight determination of macromolecules. Features include a 70,000-rpm quiet electric drive and a selection of interchangeable analytical and preparative rotors that provide forces up to 260,000 times gravity. Spinco Div., Beckman Instruments, Inc., Belmont 7, Calif. 5A
Viscosimeters. Bulletin available on the Hoeppler viscosimeter that operates on the falling ball principle (circle 66A-1) and on the Ubbelohde viscos imeter that operates on the principle of the suspended level (circle 66A-2). Fish-Schurman Corp., 72 Portman Rd., New Rochelle, N. Y. 66A-1, 2
CHEMICALS AND MATERIALS Acids, Reagent. Baker and Adamson color-codes all major "CP" acids. Both caps and labels of 5-pint bottles have bright, strong colors for instant identification. General Chemical Div., Allied Chemical & Dye Corp., 40 Rector St., N. Y. 6, Ν. Υ. 13Α-1 Chemicals, Reagent. "Baker An alyzed" reagents provide: a lot analysis on every label, a lot assay on more than 325, fast availability from nearby dis tributors, functional packaging, a broad line, and special "available by the ton" cap seals. J. T. Baker Chemical Co. Phillipsburg, N. J. 27A Chemicals, Reagents. British drug houses concentrated volumetric solu tions are available in six 500 ml. size ampoules packaged in rugged box. Adhesive tear-off label for simple, accurate labeling of 500 ml. mixing flask. The Ealing Corp., Box 90, Natick 3, Mass. 54A-1 Filter Papers. Circle 19A for analysis kit paper sampler with large assortment of 11 cm. circles in a wide selection of grades. Circle 22A-1 for a bulletin on ultra filters, including membrane, ultrafine,' cella and ultracella filters in various porosities. Circle 22A-2 for "Bac-T-FIex" folder giving full data on sterilization, filtration and cultiva tion technique. Carl Schleicher & Schuell Co., Keene, Ν. Η. 19A, 22A-1,2 Index, Chemical. New 370-page index available that lists and describes 7,344 laboratory chemicals. Fisher Scientific Co., 100 Fisher Bldg., Pittsburgh 19, Pa. 2nd Cover
Lithium. Circle 71A for experimental quantities of lithium compounds. Al though included in Group I in the Periodic Table, lithium differs in or ganic chemistry, metallurgy, inorganic chemistry and heat transfer. Lithium Corp. of America, Inc., 2525 Rand Tower, Minneapolis 2, Minn. 71A Nitroparaffins. Product improvement information available on the nitro paraffins cited as providing strong solvent power, medium boiling, mild ANALYTICAL
CHEMISTRY
