1
G O O D REASON
COORS
Why
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is the best b u y
FINEST QUALITY Scientific materials and equipment, regardless of price, must possess properties to justify their use. No amount of advertising or promotion can gain scientific recognition for a product that will not perform its function properly. Scientists h a v e favored Coors Porcelain for over forty years because they know from their own experience that the quality of Coors Por celain is constantly maintained and improved. Each piece carries a real guarantee that is con sistently upheld. The continuing program of development and research keeps Coors ahead of the field so that Coors can provide the very finest product for the modern laboratory.
For maximum resistance to thermal shock, re fractoriness and inertness to corrosive reagents, for accuracy of dimension and carefulness of workmanship — American made Coors scientific and industrial ceramics are the finest available in the world today.
COORS PORCELAIN COMPANY GOLDEN, C O L O R A D O
For further information, circle number 65 A-1 nn Readers' Service Card, page 83 A
THERMISTOR BASED TEMPERATURE MONITORING AND CONTROL YSI Thermistemp YSI Thermistemp
Tele-Thermometers Temperature
Controllers
Tele-thermometers for remote reading or recording • direct, continuous readings • interchangeable sensing units • temperature ranges from —100° to 300° F. • accuracy to ±0.2° F. • lead lengths to 5000 feet from subject • no risk of outside power variation or failure • 4%" χ 4V£" meter face calibrated directly in degrees F. and C. • medical applications: internal, skin, intramuscular, intra-cardiac • laboratory or industrial applications : liquid, surface, gas, closed vessel • portable (basic unit weighs 3 pounds) • rugged, flexible, reliable
Y E L L O W SPRINGS INSTRUMENT CO., INC. YELLOW SPRINGS, OHIO
Temperature controllers • temperature ranges from —100° to 500° F. • sensitivity ±0.1° F. • coarse and fine controls for easy, precise settings • handles 5 amp. current directly • operates on standard 110 or 220 volt power supply • plug in relays—single pole, double throw • auxiliary relays easily installed • laboratory and industrial applications • liquid, gas, solid, surface, closed vessel • sensing units: pipe plug mounted, spring loaded, etc. • rugged, flexible, reliable Pioneer research and development of thermistor based temperature measur ing, recording and control instruments by the Yellow Springs Instrument Co. has enabled us to place a reliable and inexpensive tool in your hands. Write for the 4 page catalog, YSI50A of standard YSI tele-thermome ters, controllers, and sensing units, and a list of dealers near you.
For farther information, circle number 65 A-2 on Readers' Service Card, page 83 A
VOL. 30, NO. 3, MARCH 1 958
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65 A
