"READ" with Spectrophotometric PRECISION BECKMAN
Chromatogram 24603T for Model Β
ATTACHMENTS
$290.00
• Automatically scan strips at 2" per minute. • Accurately, quantitatively measure each fraction.
24281T for Model DU
$290.00
Keep pace with new improved separa tion techniques in paper electrophore sis—"read" strips with t h e Chromato gram, t h e most precise way. Density is measured with the inherent sensitivity of t h e Beckman Spectro photometer. Distance of migration is read t o 0.005 inches o n t h e D u o Dial.
Beckman Chromatogram Attachments are available at your nearest WILL ware house where you'll find complete Beckman stocks and Beckman-approved service.
Will
CORPORATION and subsidiaries
ROCHESTER 3, Ν. Υ. · ATLANTA 1, GA. · NEW YORK 12, N.Y. · BALTIMORE 24, MO. · BUFFALO 5, Ν. Y. Fer further information, circle number 94 A-1 on Readers' Service Card, nage 69 λ
NALGON PLASTIC
trace-elements are present. National Carbon Co., 30 E. 42nd St., N. Y. C. 17. 78A Equipment, Water. Circle indicated numbers for complete information on the following equipment: ventgard bottle pumps, 8A-1; water stills, 8A-2; self-closing faucets, 8A-3; vent gard and seal, 8A-4; water demineralizers, 8A-5; and distilled water heaters, 8A-6. The Barnsted Still & Sterilizer Co., 9 Lanesville Terrace, Boston 31, Mass. 8A-I to 6 Evaporators, Rotary Vacuum. Full information 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 r.p.m. A. S. Aloe Co., 5655 Kingsburv, St. Louis 12, Mo. 73A-2 Filter Papers, Glass. Leaflet avail able on a new glass paper that combines retention with rapid nitration. H. Reeve Angel & Co., Inc., 52 Duane St., N.Y. 7. 55A-1 Filters, Analytical. Circle 23A-1 for copy of membrane filter folder, 23A-2 for desk-sized filtration chart, and 23A-3 for a sampler of company's filter papers. Carl Schleicher & Schuell Co, Keene, Ν. Η. 23Α-1,2,3 Fluorimeters. Bulletin available on line-operated multiplier fluorescence meters possessing high-sensitivity for measurement of low concentrations (fullscale for 0,001 microgram quinine sul phate). Photovolt Corp, 95 Madison Ave, N . Y . 15. 19A-3
FLEXIBLE TUBING
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. C o , 179 E. 87 S t , Ν. Υ. 26Α-2 Freeze-Drying Units. Bulletin avail able on the "Cryovaporator," a com pact, mobile freeze-dryer. Unit dries material in beakers, Petri dishes, cen trifuge tubes, or test tubes, eliminating the need for the transfer of material before or after freeze-drying. Intact materials can be dried rapidly. Solu tions containing voltaile acids, bases or organic solvents can be desiccated or freeze-dried. Palo Laboratory Supplies, Inc., 81 Reade S t , N. Y. 7. 53A
SQUARE KNOTS are not among the important re quirements of a good plastic tubing, but perfect flexi bility is. Nalgon has proven its flexibility in many out standing laboratories . . . along with •
COMPLETE NEUTRALITY · HIGH CHEMICAL RESISTANCE
•
ABSOLUTE SAFETY · EXCELLENT DIMENSIONAL STABILITY
•
TRUE TRANSPARENCY · RESISTANCE TO AGE-YELLOWING . . . and it's ECONOMICAL! You'll find many higher priced plastic tubings, but you will not find a better one, at any price, than NALGON.
Ai your Laboratory Dealer
or Write
Supply NALGE
The
NALGE
CO.,
Inc.
ROCHESTER 2. Ν. Υ. For further information, circle number 94 A-2 on Readers' Service Card, page 69 A
54 A
Furnaces, Organic Combustion. Bulletin available on tube furnace, made in 3 movable sections, that can act as one or as three separate units. Tem perature control to 1850° F. Hinged type construction. Hevi Duty Elec tric C o , Milwaukee 1, Wis. 35A-2 (Continued on page 56 A) ANALYTICAL
CHEMISTRY
