REPORT FOR ANALYTICAL CHEMISTS on the card. This collection is now out of print. (C) D o c u m e n t a t i o n of Molecular Spectroscopy ( D M S ) . This collec tion of infrared spectra is issued by B u t t e r w o r t h , Inc., a British p u b lisher, and a G e r m a n edition is p u b lished simultaneously by Verlag Chemie, G e r m a n y (7). There are two t y p e s of card, a literature card and a spectrum card. Edge-notch codes are provided for both cards. Literature cards are coded for au thor and broad general classes of subject matter. Spectral cards are coded for certain wavenumber in tervals and for certain chemical structural groups (see Figure 7 ) . Advantages of edge-notched cards are: At least some of the data are on the card. Updating or adding new items is easy. Cards are readily reproduced, so cost is low when m a n y copies are sold. For small collections of items, there is r e a d y access a t the user's desk, with nothing more t h a n a sorting needle required. D i s a d v a n t a g e s a r e : Mechanical handling is difficult or cumbersome for more t h a n a few hundred cards. I t is possible to presort if one can predict on w h a t basis the first ques tion will be asked. There is only a limited amount of coding space available. New characteristics cannot be added without redesign ing and reissuing the entire deck.
notching the hole. There m a y be more t h a n one row of holes to be notched. T h e cards notched for the sought characteristic in common will drop out of a pack of such cards when a needle or rod is inserted through the hole representing t h a t characteristic. Since only the bor der of the cards is used for the searching mechanism, the center portion m a y be used to record much of the original d a t a in t a b u l a r or graphic form. Examples of edge-notched cards are : (A) T h e M a t t h e w s index of x-ray diffraction patterns on edgenotched cards (15) t r a d e m a r k e d K e y s o r t b y R o y a l McBee Corp., P o r t Chester, Ν . Υ. These cards as purchased have the d a t a printed on t h e m b u t are not notched: in structions for notching are fur nished to the user (see Figure 5 ) . There is a code for finding the three strongest lines according to the H a n a w a l t system and also for the elements and chemical composition of the compound. (B) T h e N a t i o n a l Research Coun cil—National B u r e a u of S t a n d a r d s Collection of Infrared Spectra of about 2500 compounds was issued on edge-notched cards (17) (see Figure 6 ) . Spectral b a n d position and certain chemical structural groups are coded. T h e complete spectrum and other d a t a are shown
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