LABORATORIES, INC

---

NEW PRODUCTS Reverse Osmosis T e s t U n i t

This unit, completely assembled on a mobile cart, is useful as a control for membrane production, as a research tool for investigation of properties of semipermeable membranes, and for de­ termining suitability of reverse osmosis for purification or concentration of various solutions. The high pressure pump will force solutions through the membrane at desired pressure up to 1500 psig. A recirculation loop and feed solution container can be ar­ ranged for once through operation, or various degrees of solution recircula­ tion. Universal Water Corp., 1638 Coast Blvd., P. 0. Drawer Q, Del Mar, Calif. 02014 419

What's new in IR? Get your own free copy of The New Beckman IR Supplies Catalog and see for yourself.

I would like to have a FREE copy of the new Beckman IR Supplies Catalog—the one just published by one of the leading manufacturers of Infrared instrumentation, sam­ pling accessories and supplies. NAME FIRM

A u t o m a t i c Recording

maybe your monkey is sick! Check his temperature with a YSI Tele-Thermometer and thermistor probe. In just a few seconds you'll know if he has a fever. Or perhaps you're inter­ ested in heart chamber, intra­ muscular, and major vessel measurements. Maybe you are conducting thermal dilution studies, or want to implant a temperature sensing device in biological tissue. When you need to measure temperature — lab animals to frozen food packages, beneath the soil, under the sea, or in the air — there is a YSI probe and Tele-Thermometer to do the job. Or if you want to con­ trol t e m p e r a t u r e , we have equipment for that, too. Take care of your monkey, and write for our catalog of thermistor based temperature m e a s u r e m e n t and control equipment. YELLOW SPRINGS INSTRUMENT CO.

YELLOW SPRINGS, OHIO 45387 Circle No. 91 on Readers' Service Card

.

POSITION

Titrator

This instrument, operable in a variety of modes, speeds up test results by a factor of 10. A combination mode blends manual and automatic techniques, making it possible to ob­ tain highly accurate titration curves quite rapidly. Derivative, manual, pH control, and automatic modes may also be used. The titrator will accept any form of electrode and will ac­ commodate high or low resistance sys­ tems, aqueous or nonaqueous media, and samples ranging in size from 50 μ\ up. The instrument's modular design provides the user with a wide choice of configurations suited for pH, redox, and other potentiometric titrations, from the routine to the most complex. Bcckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92034

ADDRESS CITY STATE

ZIP

Beckman® I N S T R U M E N T S , INC. SCIENTIFIC INSTRUMENTS DIVISION FULLERTON, CALIFORNIA . 92634 INTERNATIONAL SUBS1 DIAHI F S

G E N E / A . M U N I C H , GLENROTHES. SCOTLAND.

TOKYO. P A B I S . CAPETOWN. L O N D O N .

MEXICO CITY.

STOCKHOLM.

V'ENNA

420

LR-100 Lamellar Grating Interferom­ eter operates over the 3 - 7 0 c r r r 1 spectral region with maximum effi­ ciency in the 3—20 c m - 1 range. The instrument uses 8-cm diameter optics and has been made as small as the conflicting conditions of wide fre­ quency range and high throughput will allow. A high-throughput all-re­ flecting optical system is used for maximum luminosity. Interferograms are recorded in the aperiodic scanning mode by a stepping drive which al­ lows a total linear displacement of 5 cm. Beckman Instruments, Inc., 2 5 0 0 Harbor Blvd., Fullerton, Calif. 92634 421 Circle No. 151 on Readers' Service Card V O L 4 0 , N O . 1 3 , NOVEMBER

1968

·

131

A