ANALYST'S COLUMN for evil latent in any of their discoveries really lie. The issue is, therefore, whether they do this effectively or ineffectively. I believe that scientists would do this more effectively if they could speak on political issues with more authority. I believe this authority would come best from the exercise of a self-denying ordinance in political matters—namely, by dissociating themselves from any political party whatever and behaving as public servants are expected to behave. Gas Chromatograms. Should gas chromatograms be recorded showing the time axis reading from right to left? The following note from a scientist in New England raises this point. On the cover of the February issue of
ANALYTICAL
CHEMISTRY
there is
reproduced a record of a gas chromatogram. Examination of this record shows that the time axis reads from right to left. At a recent instrument show the otherwise excellent commercial gas chromatography instruments on display all had this feature incorporated in their recorders. In view of the fact that at least one commercial instrument of foreign manufacture and probably not a few "homemade" models present records with the time axis in the normal left to right occidental fashion, this may be the proper time to urge that this design error be corrected. Let us not be backward in this matter. Having no strong views on the subject, one way or the other, we discussed this subject with several instrument people at the recent Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy. Opinion there was fairly well divided. Wc, therefore, merely wish to present the idea for consideration. Selenium. The question as to whether there is a shortage of selenium continues to arise. The Analyst's Columns for last September and December discussed this question and reported conflicting views. Another letter has been received from a college professor in Wyoming, who states that a federal agency canceled a project to develop selenium on the basis that commercial supplies were now ample. He states, however, that he has been unable to buy one ounce of a selenium salt from any supply house. His experience, he says, is matched by that of a graduate student who was unable to obtain selenium compounds for an experiment with cattle.
RUSKA DEAD WEIGHT
GAGE
REPEATABILITY IN EXGESS OF 0.01% A first order Laboratory Standard for precise pressure measurements. psi kg/cm 2 Ranges High Low
30-12140 6-2417
I N S T R U M E N T C O R P O R A T I O N
RUSKA M A K E R S
OF
2-863.05 .4-171.5
S C I E N T I F I C
I N S T R U M E N T S
4 6 0 7 Montrose Blvd. * Houston, T e x a s For further information, circle number 55 A-1 on Readers' Service Card, page 89 A
The most complete selection k>0 of t a b l e m o d e l c e n t r i f u g e s a n y w h e r e ADAMS Safety-Head— 3
models
Safeguard Angle-Head —5 Safeguard Standard —5 Junior—3 models
models
models
^ - \
\
,—* ^
All ADAMS Centrifuges are designed for rapid and efficient centrifugatîon. All (except Junior AC model) are permanently lubricated and are ruggedly built for long trouble-free life. The 52° angle of suspension on Safety-Head and Safeguard models results in 35% greater efficiency than conventional, horizontal, free-swinging centrifuges. These models are adaptable for mi-ro and semi-micro work by substituting proper shields and tubes. Ask your local dealer to demonstrate
these ADAMS
models.
Clay-Adams
NEW YORK 1 0
For further information, circle number 55 A-2 on Readers' Service Card, page 89 A VOL.
30, NO. 6, JUNE 1958
•
55 A
