Popular science monthly . ough the pro-jector, signals flashfrom the red glassbox. For example,if the herosmother is indeaths embrace,the lettersTREM, mean-ing tremolo, areflashed, and theorchestra respondsaccordingly. So accurate is the electrical cue- a recent rather Inflections marked on the paper recordare duplicated on the side of the cylinderby steel pegs that contact a magnet ing system that atamusing but exacting test given thea|)paratus, tlie signal DRUM wasflashed and obe>ed at the very instantwhen a comedian on the screen hurleda chair through a window. Xo matter at how rapid or
Popular science monthly . ough the pro-jector, signals flashfrom the red glassbox. For example,if the herosmother is indeaths embrace,the lettersTREM, mean-ing tremolo, areflashed, and theorchestra respondsaccordingly. So accurate is the electrical cue- a recent rather Inflections marked on the paper recordare duplicated on the side of the cylinderby steel pegs that contact a magnet ing system that atamusing but exacting test given thea|)paratus, tlie signal DRUM wasflashed and obe>ed at the very instantwhen a comedian on the screen hurleda chair through a window. Xo matter at how rapid or slow asjieed the film is projected, the timingof the cues to the orchestra will beaccurate. This precision is obtained byan electric contact-maker o[)erated b\-a gear on the shaft of the projection-machine handle (sec page 735). the handle makes fifteen turns aworm-gear causes electrical contact to bemade, and a current passes through wiresto the electrical orchestra director, rss Pnpuldr Srinirr Moiitlili/. The cylinder is divided intotwo parts. A nilcd strip ofpnpcr encircles one side andfifteen lines of smnll holesthe other. The lender makeshis inflection marks on thepaper at the first rehearsal wliuh is placed in the center of tlicorchestra. The current actuates anelectromagnet, the plunger of whichcatches in small notches in the left-hand rim of the cylinder and turns ila short distance. Even- time the contact at theI>rojcction machine is made, the magnet turnstlie cylinder a distance equal to one of thenotches. The apparatus is so arranged thatwhen the five or six reels of film which constitutethe ph- have been shown on the screen,the cxlinder in the orciiestra pit has matie, in asuccession of short steps, one complete re\ face of this cylinder which is made froman ordinary steel imlley, isdi\ided into two parts,as shown. Fifteen parallel lines of equalhspaced small holes, are bored around one side,while a strip of ruled jiaper encircles the o
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
