REPORT FOR ANALYSTS instruction. To stress the quantitative and mathematical or exact side of the course work it may be necessary to leave out a part of the more descriptive phases as things which can be learned without the help of an instructor and an organized class. The first course in quantitative analysis strives very hard to instill this feeling of quantitative measurement along with teaching the basic principles of chemical separations. Similar instruction should be available to the student in physics and electronics, even though it may mean that he takes portions of his course work outside the chemistry department and perhaps even a greater portion outside of the analytical chemistry division. The practice of analytical chemistry is, as is all scientific knowledge, becoming increasingly complex. The modern analytical laboratory includes many specialized techniques manned by specialists. This specialization enables better and faster analytical service to be given. It also has made possible the transition that we now see of analytical laboratories becoming problem-solving groups bringing a variety of scientific talents to bear upon chemical problems. This increasing complexity of techniques is another strong factor indicating the need for basic courses in the university. In the preface to a recent book on modern instruments in chemical analysis the authors have indicated several categories of scientists who work in the field of analytical instrumentation. One of these is the instrumentation expert who can design and build new instruments of value in chemical analysis. The second is the chemical specialist who works with one kind of instrument and is an expert in the planning, taking of data, and interpretation of the results. He confines his activities to a certain field such as radiochemistry, chemical microscopy, or infrared spectrometry. The third is the general analytical chemist who is interested in all methods of analysis and who employs the techniques which appear to him the best for the job at hand. He must seek the guidance of the expert in the particular method which suits his need. In industry the first two of these people work very closely together and, indeed, may be one man. These experts devise new analytical methods and advance the field. These are the people for whom industry has a great need.
In an Eagle Mount the slit, and plate holder are held in fixed position and the grating is positioned to bring t h e desired region of the spectrum onto the plate holder.
Baird-Atomic 3-Meter Grating Spectrograph
w h y do you nef . . . BETTER ANALYSIS THRU LESS LIGHT LOSS? The Baird-Atomic 3-Meter Grating Spectrograph with but a single reflecting surface minimizes light loss and light scattering, particularly in the important far ultraviolet region. This assures excellent identification of extremely low concentration elements. In many cases, analyses of these elements by spectrographs with 3, 4 or 5 reflecting surfaces is extremely difficult if not impossible, since too much light is lost at each reflecting surface, especially in the far ultraviolet region where the reflectivity of aluminum drops off. In such situations, the BairdAtomic Spectrograph with only one reflecting surface provides the high line-to-background ratio required for extreme sensitivity. The Baird-Atomic 3-Meter Spectrograph is a precalibrated instrument and permits all adjustments to be made from front control panel. Versatility, flexibility and high resolution for the entire camera are inherent in B-A spectrographs. Write for more detailed
information.
Baird-Atomic,
Inc.
33 UNIVERSITY ROAD, CAMBRIDGE 38. MASSACHUSETTS For further information, circle number 33 A on Readers' Service Card, page 99 A
VOL. 29, NO. 9, SEPTEMBER 1957
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33 A
