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 A POBTION OF THE "A" BOABD, SHOWING MULTIPLE-JACKS, OUTGOING departure from this year's apparatus. The or the corks, as the case may be. This ex- TBUNK-JACKS, ANSWEBING-JACKS, ANB PLUGS. changes may be slight. They…
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