ied, specially for transparency work. Till negative is nearer the lens than the bottom, and the the correspondingly numbered incoming plug of her these were on the market the amateur had, perforce, image is received on the ground glass of a second “B” board in the multiple-jack of the station… … exchange is almost certain to reveal some quired distance away by the wooden wedge departure from this year’s apparatus. The _ or the corks, as the case may be. This ex- changes may be slight. They are costly. temporized arrangement is readily secured But they increase the efficiency of the system;…
Internet Archive · Public domain (published before 1931). Free to use for anything.
