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218 PREPARATION OF LANTERN SLIDES [Cn. VIII
specimens are now mounted. This gave a very transparent and vivid picture.
§ 337. Labeling lantern slides. — Besides the mark or spot as guide to inserting the slides in the carrier, every lantern slide should have a label stating what it is, and if copied from some book or periodical it should give the name of the publication from which derived and the number of the figure.
Slides are also numbered for convenience in arrangement at the time of an exhibition. Some workers simply number the slides and have no label. This is, of course, feasible for a small collection to be used by one individual, but the slides are practically useless for any one else unless they are labeled.
Sometimes slides are numbered, and a catalogue kept with corresponding numbers and a description of the slide. For one unfamiliar with the collection the numbers and the cards are not easy to put together. Then one is liable to have more than one series, and the series are liable to get mixed. With a label on each slide, the collection can be made use of by any one.
§ 338. Storing lantern slides. — The problem of storing a large collection of lantern slides is a serious one. A still more serious problem is to find the slides needed for a given lecture or demonstration.
A common method of storing is to have a cabinet like that used for the card catalogue of libraries, and to put the slides in the drawers as the catalogue cards are filed.
One can use name cards to designate groups of slides as they are used to group catalogue cards.
In order to store and make them most easily available for use, Professor George S. Molcr of the department of Physics in Cornell University has devised a cabinet which holds the slides in a single vertical layer, so that when any holder is pulled out the slides are all exhibited, and one can see exactly what the slides are and select those desired.
This seems to the writers of this book, by all odds, the most practical cabinet yet devised for safely storing slides and making them available with the least trouble and the least waste of time (fig. 120).