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 and the Home
Hitachi, Ltd. Tokyo Japan Ταλ\ΛΑθ
Circle No. 34 on Readers' Service Card
Curtin custom Chromatographic Columns (or any standard or special chromatograph
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Chromatographic columns for any instrument, standard or special, and packing for any appli cation can b e supplied promptly by Curtin. Columns are furnished complete a n d ready to use with fittings a n d packing as specified. Packing, consisting of one solid adsorbent or any inert support and substrate, can b e selected from more t h a n 175 stock packings listed in Curtin Catalog C-64. Specify manufacturer a n d model n u m b e r of any standard chromatograph . . . or dimensions
and configuration of column desired for non standard instruments. Custom columns are $17.50 each . . . plus $1.00 per foot for aluminum or copper tubing and $2.00 per foot for stainless steel tubing.
W.H. CURTIN & CO. SCIENTIFIC
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ANALYTICAL CHEMISTRY
