Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . r friction on the picture-bearingsurface of the film is entirely done away with. Thedog is so geared as to leave the picture at rest for aperiod eight times as long as that occupied m the majority of views this rapidity enables ashutter to be dispensed with, but in subjects havingstrong high-lights a rainy effect may be produced, whilein a picture having little shadow the amount of hghtreaching the screen may be sufficient to impair thebrilliancy of t
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . r friction on the picture-bearingsurface of the film is entirely done away with. Thedog is so geared as to leave the picture at rest for aperiod eight times as long as that occupied m the majority of views this rapidity enables ashutter to be dispensed with, but in subjects havingstrong high-lights a rainy effect may be produced, whilein a picture having little shadow the amount of hghtreaching the screen may be sufficient to impair thebrilliancy of the view. To meet these contingenciesan adjustable shutter is provided, shaped as a four-armed cross with narrow blades, each of which acts asa shutter. These arms are so narrow, and the shutteris so exactly placed at the most condensed portion of 134 LIVING PICTURES. the beam of light, that it fully effects its purposewithout giving rise to perceptible flicker. The spool-standards are specially arranged with a reel-stopallowing rapid changing, and at the same time theywill take spool-reels up to eleven inches diameter ; that. Fig. 146. is to say, 1,000 feet of film may be placed on themachine in one length. Indeed, even larger spoolsmay be arranged for, up to 2,000 feet capacity; andthe Bioscope Camera will accommodate an equallength, a fact which enables a continuous scene of thirtyminutes duration to be projected. One other point is. PRESENT-DA Y APPABA TUS. 135 illustrated in Fig. 146. It will be seen that the baseof the Bioscope itself is pivoted on the base-board ofthe lantern, and its framework bears two projectionlenses. When the machine is turned aside in order tochange a film, the other lens (suitable for ordinaryprojection) is automatically brought into position, andlantern-slides inserted in the usual carrier may be shownin the interval without any of those awkward pauseswhich tend so much to distract and dissatisfy theaverage audience. The accessories to this machin
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
