NEW PRODUCTS
250ml 11000
M-fifi* 50ml
12940
Π
$
474
pushing the "start" button. Release of the beam, weight selection, and op tical scale reading are all programmed by a control chassis so that sample weight can be read within 30 to 45 seconds. Weight is read to six signifi cant figures—00.0000 gram to 99.9999 grams on three Nixie tubes and an optical scale with an auto-indicating vernier. The program chassis can be preset to within 0.1 gram of sample weight, reducing the weighing time when large numbers of weighings of the same approximate value are to be made. Voland Corp., 27 Centre Ave., New Rochelle, Ν. Y. 10S02. 436
Announcing The New MISCO CR-1 SPECTR0LAT0R'
*
24/40 16560 F0R
11.83 *
\\ *' 14980
The line is quite complete. You'll find 72 items in beakers, crucibles, dishes, flasks, ground joints, heaters, tubes; 33 differ ent sizes of tubing. They're all listed and indexed in our regular PYREX® brand ware catalog. If you don't have a copy, write for one. *A11 the prices above are net each. You can get the prices even lower since we give our regular labware quantity discounts which range as high as 28%. If you have any questions, write to Laboratory Glassware Dept., 3905 Crystal St., Corning, N.Y.
CORNING WORKS
Circle No. 28 on Readers' Service Card ·
FOR C O N T I N U O U S PURIFICATION AND
This is VYCOR® brand labware. Compare it with fused quartz: You can work continuously at 900° to 1 0 0 0 ° C . (1652° t o 1832°F.) with this' 96% silica ware. I t will even go to 1200 °C. (2102°F.) for short periods. It will withstand a 900 °C. thermal shock without a shudder. But it costs considerably less.
138 A
THE CR-1 IS A RESEARCH
250ml
If you use clear fused quartz, ... check these prices
C O R N I N G GLASS
CONTINUOUS-FLOW ELECTROCHROMATOGRAPHY THAT'S FAST, EASY, EFFICIENT, ACCURATE
ANALYTICAL CHEMISTRY
NECESSITY
SEPARATION COLLECTION
UNIQUE FEATURES OF THE CR-1
The ElectroniK 19 measures signals from 100 microvolts to 100 volts with out using auxiliary equipment. This range is believed to be the widest yet achieved. Weighing only 20 pounds, the recorder has a y 3 -second speed of response and a rated accuracy of ± 0 . 2 5 % of span or 1 microvolt. The instrument is designed specifically for use in conjunction with low impedance sensing devices, high impedance bridge circuits, and high level d.c. sig nals. Honeywell, Philadelphia Divi sion M389, Wayne & Windrim Aves., Philadlephia, Pa. 19144. 437
• I n c r e a s e d power for g r e a t e r r e s o l u tion in s e p a r a t i o n s . 3, 000 ν at 200 m a providing r e l i a b l e and p r e c i s e t e m p e r a t u r e , voltage and a m p e r a g e control. • Integrated r e f r i g e r a t i o n s y s t e m (an engineering advance in itself) with automatic defrost, invaluable for long, continuous r u n s . • 27 to 54 fraction collection p o i n t s . • Reliable and constant control of e l e c t r o c h e m i c a l heat t r a n s f e r and e l e c tronically r e l a t e d equilibria. • Resolution and pure fractions 50% to 100% g r e a t e r than any previously a t tainable.
Spectrophotometer Cells • A c c u r a t e control of buffer flow rates·
A comprehensive line of precision cells includes more than 25 shapes made of glass, standard silica, as well as special far ultraviolet and near infrared transmitting quartz. These cells are made by the English optical works of Perkin-Elmer by a unique process which eliminates bonding materials, and the tolerances are extremely nar row. The precision of the light path is guaranteed within 0.01 mm. The cells fit standard spectrophotometers and are available in matched sets of 2 and 4. A 4-page descriptive bulletin, No. 900, contains specifications and prices. Photovolt Corp., 1115 Broad way, New York, Ν. Υ. 10010. 438
MISCO, a pioneer in electrochromatography instrumentation offers a powerful r e s e a r c h tool utilizing a vertical paper curtain for the analysis, separation and purification of complex entities as tox oids, vitamins, hormones, purified i n jectables, RNA, DNA and viral compo nents in virology and genetic research. If youhave a special separation or puri fication problem in.any of these or r e lated fields, write us.
MICROCHEMICAL SPECIALTIES CO. 1825
E A S T S H O R E
H I G H W A Y
BERKELEY 10, C A L I F O R N I A Circle No. 57 on Readers' Service Card
