the distance of target to specimen could be reduced to perhaps one third that required by the tube used here. This would permit a ninefold gain in intensity.The geometry of the simple arrangement shown in Figure 1 can readily be altered to accommodate several specimens simultaneously, if desired. A four-window x-ray tube can obviously serve four samples simultaneously. After the spectrum is once
Infrared absorption spectra from 2 to 15 microns are given for a number of pure long-chain saturated and monounsaturated fatty acids, methyl esters, triglycerides, and alcohols. The four classes of compounds studied are readily distinguished by spectral features common to the members of each class. Within each class, trans compounds are readily distinguished from cis and/or saturated compounds, but the two last-named types can be differentiated only by careful examination of their AS A preliminary step in the application of infrared spectros-_i\_ copy to a variety of problems being conducted in the authors' laboratories, and in particular to studies of the reaction of fatty materials with oxygen, it was necessary to obtain reference spectra from 2 to 15 microns on a wide variety of pure longchain compounds. With few exceptions (1, 21) published spectra on long-chain aliphatic compounds cover a limited range {10, 18, 20) or the purity of the starting materials is unknown {3).
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