Product Capsules Freeze-Drying A p p a r a t u s . Circle 38A for details on company's new "Centri-Freeze" cited as being a com plete freeze-drying laboratory on wheels. Stainless steel cart is 40" long, 28" wide, and 35" high. Lucite v a c u u m d r u m is 17" high, 12" in diameter. Arthur S. LaPine and Co., 6001 So. Knox Ave., Chicago 29, 111. 38A Funnels, Separatory. Company's fun nels are heavy walled y e t have little thermal stress because they are made of Pyrex glass. Seals between bulb and stopcock, and stopcock and outlet t u b ing are re-enforced. Tip is fire-polished. Corning Glass Works, 72-4 Crystal St., Corning, Ν . Υ . 34Α Furnaces. Complete d a t a available on furnace for general lab work and process control. Chamber size: 4" X 3 3 / 4 " or 9". Variable temperature control from 350° F. to 1800° F. Welded steel construction, embedded element plates. T h e r m o Electric Manufacturing Co., 478 Huff St., D u b u q u e , Iowa 90A-2 Furnaces. Bulletin available onlaboratory muffle furnace with temperature range to 2300 ° F . All temperature con trol and indicating devices are located in the furnace pyramid base. Hevi D u t y
Electric Co., Milwaukee 1, Wis.
41A-2 Furnaces. Bulletin available on com p a n y ' s compact laboratory box furnaces cited as being ideal for heat treating small parts, ash determinations, fusions, ignitions, assaying, and dry precipitates. 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. 86A-1 Furnaces. Bulletin available on com p a n y ' s tube t y p e laboratory furnace cited as being ideal for annealing, brazing, heat treatment, hardening, sintering, reducing metal powders, silver soldering, and nitriding. 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. 89A-3 G l a s s A p p a r a t u s . Circle 67A for copy of special a p p a r a t u s catalog, "Custom M a d e Laboratory Glassware." Con tains hundreds of special pieces of laboratory glassware. Corning Glass Works, 69-4 Crystal St., Corning, Ν . Υ.
67A Heating T a p e s . Company's new flex ible electrothermal pipe heaters are waterproof and acid and alkali resistant.
Available in 12.S', 2 5 ' or 5 0 ' lengths. Consistant temperatures up to 100° C. E . Machlett & Son, 220 E a s t 23rd St., X . Y. 10, Χ . Υ. 91Α-1 Laboratory A p p a r a t u s . Circle 69A-1 for catalog on company's scientific instruments and apparatus. Catalog includes information on weighing fun nels, polyethylene wash bottles, and filter bells. Xew York Laboratory Supply Co., Inc., 76 Varick St., X. Y. 13, Ν. Υ . 69Α-1 Laboratory Furniture. Circle 24A-1 for copy of "Steelab." Contains hun dreds of ideas for laboratory furniture layouts. Circle 24A-2 for copy of " F u m e H o o d s , " a complete fume control prospectus. Laboratory F u r niture Co., Inc., Mineola, L. I., X. Y. 24A-1, 2 Laboratory Furniture. Brochure avail able on " M o d u l i n e " unitized steel fur niture cited as being flexible in function and arrangement, permanent in its allwelded construction, and economical in initial cost and upkeep. Aloe Scientific, Div. of A. S. Aloe Co., 5655 Kingsbury, St. Louis 12, M o . 56A-1 (Continued on "page 67 A)
Safeguarding the Purity of the Purest Water —
BARNSTEAD
VENTGARD Bottle Pump Pumps out distilled water while permitting only purified air to enter. Prevents air-borne contamination of distilled water and standardized solutions. Scientific tests show that it effectively filters particulate matter as small as 0.2 micron from the air before it enters the container. Bacteria, bacilli, organic vapors, alkali and acid gases, and COj are effectively removed by the efficient filter unit. Cost for this protection is low . . . filter unit need only be replaced after 1000 gallons have been pumped. The Barnstead Bottle Pump with Ventgard is easily affixed to carboy or bottle. WRITE FOR BULLETIN NO. 136
B
arhstead STILL &
DIMINERALIZER
CO.
Makers of Water Stills and Oemineralizers for Every Pure Water Need
The Cambridge Research Model p H Meter measures p H and millivolt values where extreme precision and reliability are required. Although originally designed for biological and physiological use, the instrument is particularly useful in the Chemical, Pharmaceutical and Process Industries. The combination of features is not to be found in any other similar instrument.
CAMBRIDGE INSTRUMENT COMPANY, INC. 3 5 1 4 Grand Central Terminal, N e w York 17, Ν . Υ.
9 Lanesville Terrace, Boston 3 1 , Mass. PIONEER MANUFACTURERS OF PRECISION INSTRUMENTS Circle No. 66 A-1 on Readers' Service Card, page 77 A 66 A
·
ANALYTICAL CHEMISTRY
Circle No. 66 A-2 on Readers' Service Card, page 77 A
