MODEL C ROTARY EVAPORATOR All glass a n d Teflon surfaces: N o metal, rubber or grease to react with sensitive materials.
High-vacuum, low-temperature JLotary Evaporator from CaLab features:
Greaseless vacuum seal: Teflon ball joint in stationary glass socket joint forms seal that maintains 0.1 mm vacuum while flask and shaft rotate. Continuous addition: Easily adapted for either continuous addition rotary evaporation of flash evaporation. H e a v y - d u t y motor: Fully enclosed Bodine induction motor powers unit with sparkless, quiet, cool-running operation.
For full information on the Model C Rotary Evaporator, write for Brochure AE.
California Laboratory Equipment Company Berkeley 10, California
1717 F i f t h S t r e e t Circle No. 183 on Readers' Service Card
LOOK TO HITACHI FOR HIGH PURITY SPECTROSCOPIC ELECTRODES Hitachi's spectroscopic electrode contains practically no impurities when used in the normal methods of spectro-analysis. At Hitachi the entire production process is strictly controlled to assure product standardization. The result is a carbon widely acclaimed for purity and uniformity. Two types are available — Extra High Purity Grade and High Purity Grade. Extra High Purity Grade is Hitachi's highest purity and guaranteed. Even the minute particles are controlled. High Purity Grade is designed for conventional use. A restricted amount of minute particles are present. However,
this grade is of far greater purity than electrodes previously used and results in substantial savings. Hitachi offers a wide variety of electrodes and powders. Rods are available in the following diameters: 3mm, 5mm, 6.15mm, 8mm with lengths of 150mm and 305mm. Powders are available in 200 mesh and 300 mesh and there are more than 60 types of preformed electrodes. This is Hitachi, manufacturer of more than 10,000 products, bringing you the finest first. Look for the name and buy with confidence. It's your guarantee of quality wherever it appears.
A Half-Century of Progress — In Industry a n d t h e H o m e
Hitachi, Ltd. Tokyo
Circle No. 42 on Readers' Service Card 162 A
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ANALYTICAL CHEMISTRY
Japan
