Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 674
ocall the operators attention to the sufficient winding of the roll by anaudible signal, a stroke on a little bell tells that everything is ready for anew exposure. In some cases the number of exposures already made isregistered by figuresthat appear on theoutside. The paperin these processes… … ■ The Roll-Slide. Fig. 311a. prints are taken as usual. The operations required for the transferringrequire considerable dexterity of manipulation, and to both the paper andthe glass special preparations have to be applied, before and after thetransference of the film. This plan, therefore, of…
Inventions
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