Product Capsules Determination A p p a r a t u s . Circle 57A for catalog providing full descrip tion and photos of all Labconco protein, fat and fiber apparatus. Catalog in cludes Kjeldahl a p p a r a t u s for protein determination, micro-Kjeldahl digestor, crude fiber condenser, and Goldfisch fat extractors. Laboratory Construction Co., 1109 Holmes St., K a n s a s City, Mo. 57A Distilled Water Equipment. Bulle tin available describing company's tinlined piping, fitting, valves, and faucets for distilled water distribution systems. Barnstead Still & Demineralizer Co., 9 Lanesville Terrace, Boston 31, Mass. 4 4 A-1 Electroanalysis A p p a r a t u s . Bulle tin available on company's ultra-speed electro-analyzer for swift or volume de terminations. Example: provides copper assay in 8 minutes. Eberbach Corp., A n n Arbor, Mich. 54A Filters, Interference. Bulletin avail able on company's monochromatic in terference filters t h a t isolate narrow regions of the spectrum and provide high transmission. F a r r a n d Optical Co., Inc., Bronx Blvd. & E a s t 238th St., N . Y. 70, Ν . Υ. 98Α-1 Fluorimeters. K l e t t fluorimeters are designed for the rapid and accurate
determination of thiamin, riboflavin, and other substances which fluoresce in solution. K l e t t Manufacturing Co., 179 E a s t 87th St., Ν . Υ., Ν . Υ. 4 8 Α - 2 Fluorimeters. Bulletin available on line-operated multiplier fluorescence meter possessing high-sensitivity for measurement of low concentrations. Photovolt Corp., 95 Madison Ave., N . Y. 15, Ν . Υ. 31A-3 Fraction Collectors. Bulletin avail able on t h e new " R i n c o " fraction collec tor for t h e a u t o m a t i c collection of frac tions b y timed-flow or volumetric method. Collects 237 fractions. Nei ther mercury n o r current contacts sam ple. Aloe Scientific Div., A. S. Aloe Co., 5655 Kingsbury, St. Louis 12, Mo. 47A Freeze-Drying A p p a r a t u s . Circle 105A-1 for details on company's new "Centri-Freeze" cited as being an ex tremely versatile, fully automatic, com pletely self-contained freeze-drying lab oratory on wheels. Samples m a y be placed in unfrozen. Circle 105A-2 for details on company's "Roto-Freeze" drying a p p a r a t u s . E. M a c h l e t t & Son, 220 E a s t 23rd St., N . Y. 10, Ν . Υ. 105A-1,2 Furnaces. Bulletin available on com pact laboratory pot crucible furnace.
Safeguarding the Purity of the Purest Water —
BARNSTEAD Tin-lined PIPING FITTING . VALVES FAUCETS for Distilled Water Distribution Systems With over 75 years of experience in manufacturing water stills and solving pure water problems, Barnstead now offers a complete line of tin-lined pipe, valves, and faucets designed specifically for use with distilled or demineralized water distribution systems. Barnstead's tin-lined brass piping gives you all the desirable chemical characteristics of pure tin plus the strength and durability of metal pipe. The pure tin is permanently bonded to the pipe so that installations can be enclosed in walls, or floors' . . . concealed like other piping . . . with the assurance that it will outlast all other piping in the building, delivering pure, distilled water without traces of metal and other impurities, for laboratory and scientific use.
L a b o r a t o r y E q u i p m e n t Div., Lindberg Engineering Co., 2440 W. H u b b a r d St., Chicago 12, 111. 45A-2 Furnaces. Bulletin available on laboratory furnace with temperature range to 2600°. Transformer provides 48 steps of adjustment. Pyrometer and a m m e t e r mounted. Ceramic muffle forms t h e heating chamber. Inside dimensions: 4" X 3 " X 7". Hevi D u t y Electric Co., Milwaukee 1, Wis.
63A-2 Furnaces a n d Titrators. Company's improved " H - F " induction units (circle 99A-2 for details) and automatic titra tors for t h e determination of sulfur in petroleum a n d metal products (circle 99A-3 for details) will be on display in Booth N o . 20 a t the Pittsburgh Confer ence. Laboratory E q u i p m e n t Div., Lindberg Engineering Co., 2440 W. H u b b a r d St., Chicago 12, 111. 9 9 A - 2 , 3 Fused Quartz Ware. Bulletin avail able on "Vitreosil" tubing, crucibles, dishes, trays, muffles, pots, retorts, tanks, electric immersion heaters, ball & socket joints, standard taper joints, a n d graded seals. Thermal American Fused Quartz Co., Inc., 18-20 Salem St., Dover, N . J. 58A (Continued on page 6S A)
Prove ft fo yoane/f... When buying flasks—or ony laboratory glassware—let the " T W O - W A Y " Test be your proof of value. It is a practical, easy method to determine if you are getting the most for your lab glass dollar.
HERE'S THE "TWO-WAY" TEST ! STEP 1 . Obtain samples of v a r ious brands of advertised glass ware including DOERR DIA M O N D D BLUE LINE. Subject this glassware t o the most stringent tests you can devise. Record the results of your tests. STEP 2. Compare the prices. The odds are t h a t you will find more value for less money in the Diamond D Blue .Line. Ask your dealer about the Diamond D Blue Line or send for more detailed information today.
WRITE FOR BULLETIN NO. 139
Pure Water Specialists Since 1878
Barnstead STILL & DEMINERALIZER CO.
9 Lanesville Terrace, Boston 31, Mass. Circle No. 62 A-1 on Readers' Service Card, page 75 A
62 A
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ANALYTICAL CHEMISTRY
DOERR GLASS COMPANY Vineland, N. J. Circle No. 52 A-2 on Readers' Service Card, gage 75 A
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