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Then a M. Rochas informs the Académie, that a photographic image on a metal-plate, transferred immediately to albumenised glass, may be reproduced and multiplied on paper in any number. Daguerreotypes of waves beating on the sea-shore have been exhibited, which were taken on glass thus prepared in a very minute fraction of a second.
a, stem of the grapnel containing core; b, flukes; c, recess for insulated contact-plate connected to core; d, covering plate screwed on bottom of grapnel; e, button of plug; f, rubber washer and button; g, metal-plate; h, stem of plug, on which in the under counter-sink, U is a small metal disk which prevents the fittings from fallings out; i, needle; j, spring; k, counter-sink for head of plug; l, counter-sink for spring.
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