Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . ers and inventors who saw a possible remunerativefield for the exercise of their talents was doubtlesslargely responsible for the rapid progress towards effective projectionwhich was madeduring the nextthree years. On September the24th, 1892, Mayerfied an Americanspecification (No. Fig. 80. 525990 which shows a new formof step-by-step motion (Fig. 80). A tappet, P, withinclined faces is drawn to and fro between parallelguides by means of a crank, C, and each time t
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . ers and inventors who saw a possible remunerativefield for the exercise of their talents was doubtlesslargely responsible for the rapid progress towards effective projectionwhich was madeduring the nextthree years. On September the24th, 1892, Mayerfied an Americanspecification (No. Fig. 80. 525990 which shows a new formof step-by-step motion (Fig. 80). A tappet, P, withinclined faces is drawn to and fro between parallelguides by means of a crank, C, and each time the framecarrying it reaches the top or bottom of its stroke theinclined face of the tappet strikes the inclined face of atooth, T, thus driving the drum onwards. This forwardmotion ended, the tappet enters the straight portionbetween two teeth and so steadies the wheel. On itsreturn journey it leaves this space centred against theslide, and the circle of teeth consisting in an oddnumber, there is naturally a tooth ready placed foracting on when the tappet reaches the end of itsstroke. After the wheel has been steadied by the. CHRONO-PHOTOGRAPHY. 81 tappet a slight pressure is maintained by detent-springsto prevent accidental displacement. In the same year (1892) a suggestion was made in The Optician and Photographic Trades Reviewwhich, considered from the purely theoretical side, isof considerable interest though the practical difficultiesinvolved are obvious. It was based on a modificationof the ordinary panoramic camera, in which, as is wellknown, the whole camera revolves horizontally aboutthe optical centre of the lens. The image is thrownon a film carried round a curved bearing-surface, ascreen confining the action of the lens to a compara-tively small angle. When the curved film extends over180 degrees a half-revolution of the camera forms apicture of one-half the horizon ; but if the film is fedfrom one side and taken up at the other a completerevolution may be accomplis
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
