Lantern slides : how to make and color them (1895)
Elmendorf, Dwight L. (Dwight Lathrop), 1859-1929 · New York : E. & H.T. Anthony & Co. · leaf 66
CHAPTER IV. Testing Slides. SLIDES which appear to be very good while wet should be carefully examined when dry. Generally they gain in density as they dry, es- pecially if they are dried rapidly. A very nice little instrument for testing slides … other frame made to hold a lantern slide. This is connected with the lens frame by a bellows which excludes all light except that which passes through the slide. Upon looking through the lens at a slide inserted in place, an enlarged image is seen, and the general quality of the slide may be judged…
Slides (Photography)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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