Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . askelynes 1896 rotating lens-drmii, which serv^es asomewhat similar purpose, though the comparison mustbe taken in a purely historical sense, and not in apractical one. Another important optical method which has beenput into practice is the use of a mirror turning at sucha speed as to maintain the beam of light passing throughthe lens in a right line. The origin of this idea maybe found in Reynauds Praxinoscope (Fig. 23), and itslatest developments in Campbell and
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . askelynes 1896 rotating lens-drmii, which serv^es asomewhat similar purpose, though the comparison mustbe taken in a purely historical sense, and not in apractical one. Another important optical method which has beenput into practice is the use of a mirror turning at sucha speed as to maintain the beam of light passing throughthe lens in a right line. The origin of this idea maybe found in Reynauds Praxinoscope (Fig. 23), and itslatest developments in Campbell and Caslers inven-tions of the year 1897. Suggestions involving the useof a cyclostat, such as mentioned on page 85, also fallwithin the same category, the general principle involvedbeing this : A revolving image may be renderedoptically stationary by the interposition of a reflectingsurface moving in the same direction but at half thespeed. The two principal instances of moving lens andimage together have been noticed in Figs. 85 and 90,and Bonellis invention of the year 1865 also bears onthe same question. 114 LIVING Fig. Bi. Fthn moved inter mitt e^ttly by rollers actuatedby wheel and teeth or pegs. To introduce this class an illustration may be givenwhich has nothing whatever to do with the LivingPicture. In fact, a prize competition might be startedfor the first correct answer as to the use of the apparatus shown in Fig. 115; but as thereare no prizes, it may be statedat once that the figure is adrawing of a lawn - mowingmachine with projecting , it will serve betterthan any other as a foundationfor the discussion of us imagine the wheel e tobe joined to the axle of an ordinary sprocket-roller, itwill be seen that if the upper axle were rotated the wheele would be partially revolved every time the segment dacted upon it. Further, if the segment contained theright number of teeth, the wheel e might be rotated tothe exact extent neces
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
