Parr INSTRUMENT COMPANY - Analytical Chemistry (ACS

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38A

ANALYTICAL

CHEMISTRY

THE BASIC TOOLS FOR EVERY BIOCHEMICAL LABORATORY

Parr O X Y G E N

BOMB

3îocÂemiccU 9ïiatnM+nestti ELECTROPHORESIS APPARATUS The large Aminco-Stern research model (left) is intended for heavy work output, using a large variety of sample volumes. The Aminco Portable Apparatus (not shown) is designed for routine research and clinical use on a smaller scale. Both models constitute complete electrophoresis laboratories in single, compact units. They combine precise schlieren optics, automatic refrigeration, high-voltage supply, and rapid dialysis facilities. Accessories available for macro-preparative work, adsorption chromatography, diffusion measurements, and routine clinical analysis. BULLETINS 2175-B and 2281-B

WARBURG MANOMETRIC APPARATUS Series 1300 Plain Jacket

Series 1200 Adiabatic Jacket

T

HESE PARR Calorimeters, improved in

These greatly improved instruments represent the latest developments in manometric apparatus. The Aminco-Lardy Rotary Warburg Unit (right) can be rotated so that any manometer can be brought before the operator while he remains in a fixed position. Manometers may be read while in motion, or stopped individually. The Dual-shaker Apparatus (not shown) embodies two independent shaking mechanisms. Both types have wobble-free manometers, and are available in heated and refrigerated models. BULLETIN 2185-B

several respects for greater convenience and efficiency,

either

single

or

can be furnished

double

valve

PARR

with

LIGHT-SCATTERING APPARATUS

self-

thermal leakage t o a minimum. Radiation cor-

This compact and sensitive indicating and recording microphotometer directly measures from 20 micromierolumens to 20 lumens of scattered light in five decade ranges. It has internal electronic stabilization, builtin d-c. amplifier, removable slit and optical systems, and outlet for recordei operation. Completely a-c. operated.

rection must be applied using the procedure

BULLETIN 2182-B

sealing oxygen bombs. The Series 1300, plain jacket calorimeter, has a non-metallic insulating jacket which holds

specified in A.S.T.M.

Designation:

D27I-48.

The Series 1200, A d i a b a t i c Calorimeter, requires no radiation corrections thereby

per-

mitting rapid tests with minimum calculations.

For

complete

PARR

Dealer

details, or

write

ask

your

direct

to

factory.

HIGH-SPEED ANGLE CENTRIFUGE A reliable, safe, and modern high-speed centrifuge with unique balancing mechanism that assures greater speed and safety. R.C.F. developed: 25,000 g at full speed of 14,000 rpm. Tube angle 3 2 ° . Interchangeable standardized rotors and maximum flexibility. Integral control panel and guard. Minimum servicing and low-cost maintenance.

AMERICAN INSTRUMENT CO., INC.

Parr INSTRUMENT COMPANY EST.

o(a/Hyuz6&î&\AiooiMmen£&—

IB'J'J

'" -ERS OF (.AIORIMETERS AND I'RFSSURE REACTION E0UIPMl.N1

SILVER SPRING, M D . — I N

METROPOLITAN

W A S H I N G T O N , D. C.