COLEMAN
no blind alley with this colorimeter The Coleman Electric Color imeter is different. Other colorimeters, while some times adequate for their orig inal purpose, lead only to a dead end when it comes time to upgrade laboratory capabil ity to the more advanced tech niques of spectrophotometry. N o t so w i t h t h e C o l e m a n Colorimeter. It provides an easy economical means for growth into spectrophotometry. It uses exactly the same cuvettes, adapters, accessories — even t h e s a m e p o w e r s u p p l y — as t h e f a m o u s C o l e m a n Junior Spectrophotometer. Techniques of operation are almost identical . . . your labo ratory technicians can make an immediate transition from colorimetry to spectrophotometry with the Junior. Finally, when the major an alytical workload is transferred to the Junior, the Coleman Col orimeter r e m a i n s a v a l u a b l e standby instrument. Avoid planned obsolescence in your instrumentation plan ning . . . equip your laboratory for future growth. Write for Coleman Colorimeter Bulletin AB-254 and Junior Spec trophotometer Bulletin AB-240B. COLEMAN INSTRUMENTS, INC. MAYWOOD, ILLINOIS Circle No. 137 on Readers' Service Card 132 A
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ANALYTICAL CHEMISTRY
NEW PRODUCTS
Microtome knife sharpener is fully automatic. It employs a 15-inch glass plate with combined oscillatory and rotary motion. Other features include changeable level angle, two speed changeover, timing mechanism, pressure control, oil damping and lapping bar. Elliott Model. William J. Hacker & Co., Inc., P.O. Box 646, West Caldwell, N. J. 424
Power Controller A solid-state proportional alternating current controller, called Dynapac, pro vides exacting temperature and power control. Using a thermistor as tem perature sensor, it has a response time to any temperature change of 16 milli seconds. One model has a 2400 watt capacity; a second, 4800 watts. Details appear in Bulletin 675. Dynatronic In struments Corp., 3070 West Grand Ave., Chicago 22, 111. 425
Pu: Be neutron sources for GREATER SAFETY low extraneous radiation proven source design double encapsulation special hi-integrity welds
MOBILITY & FLEXIBILITY low gamma radiation less shield, weight, space wider range of application
LOWER COSTS Total costs for either purchase or rental use of NUMEC Pu:Be neutron sources less than rental p r i c e of c o m p a r a b l e Ra : Be sou rces. Ease of calibration due to con stant neutron emission — savings in time and money.
NUMEC standard Pu:Be sources include 1, 2, 3, 4, 5, 7 and 10 curie sizes. ALPHA, BETA, GAMMA, and o t h e r NEUTRON sources also available.
Top-loading scale, the Sauter Toppan, is designed for fast, accurate weigh ing up to 5 lb. It works on a sub stitution weighing principle. August Sauter of New York Inc., 866 Willis Ave., Albertson, Ν. Υ. 426
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Circle No. 166 on Readers' Service Card
