NEW PRODUCTS
A microtitrator is designed for titra tions of sample volumes in the ultramicro range. The titrator features a multi-cup turntable and power vibra tion stirrer. Titrant is held in a hori zontal glass buret and delivered by t u r n i n g a micrometer-type screw. De livery accuracy is ± 0 . 0 1 microliter. Samples are held in small, dispos able plastic cups in a 10-cup turn table. Beckman Instruments, Inc., Spinco Div., Palo Alto, Calif. 435 Chloride Titrator Attachment Chloride concentration can be read directly in milliequivalents with a direct reader attachment for the Cotlove automatic chloride titrator. The direct reader automatically subtracts reagent blank time and presents net titration time in milliequivalents per liter on a digital register. Variation with 0.1ml. samples is ±0.05%. This attach ment is described in a bulletin. (No. 4-2050). Buchler Instruments, Inc., 514 W. 147th St., New York 31, Ν. Υ. 436
ALBERENE STONE
for 75 years the only perma nently satisfactory material for chemical laboratory table tops, shelving, sinks, splash backs, drain boards and fume hoods. Prompt delivery. ALBERENE S T O N E - A DIVISION OF THE GEORGIA M A R B L E COMPANY. For FREE l i t e r a t u r e a n d t e c h n i c a l assistance address: THE ALBERMAR COMPANY, 386 PARK AVE. SOUTH, NEW YORK 16, N. Y., DEPT. C. Circle No. 2 on Readers' Service Card
NEW! "PREPKRO" PREPARATORY GAS CHROMATOGRAPH
Laboratory potentiometer is a low-cost compact model for student use. It features printed circuit switch con trols for fifteen 10-ohm resistors. A ratio-multiplier switch gives three ranges: 0 t o 1.6 v., 0 to 0.16 v., and 0 to 0 . 0 1 6 v. Cat. No. 8 3 4 1 2 . Cenco Instruments Corp., 6 4 5 0 W. Cortland St., Chicago 3 5 , III. 437
• large sample capacity
This versatile, inexpensive gas chromato graphic unit is designed specifically for pr epar at iv e w o r k . " P r e p K r o " is equipped with a complete, simple a n d efficient collection system f o r t r a p p i n g sample components. A l t h o u g h it is designed as a l o w cost preparatory column, samples as small as 0.010 ml w i l l produce greater than full scale response on a 0 - 1 0 mv recorder. Needed in every laboratory f o r making large separations impossible by distillation a n d other conventional means.
• collection system WRITE FOR BROCHURE TODAY: • 3 / 4 " χ 6' or 12' columns • preheater • automatic heat control
nester / faust
• operation to above 250 C
2401 Ogletown Road, Newark, Del. Circle No. 1S3 on Readers' Service Card V O L 3 4 , N O . 7, JUNE 1 9 6 2 ·
131 A
