Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . 159. MASKELYNE S MUTAGRAPH. This instrument is of interest not only from its greatsuccess at the Egyptian Hall, but also on account of theextreme ingenuity displayed in its construction. It isfounded on purely optical principles, which had beendimly foreseen by Clerk-Maxwell (see page 26). Theaction is, moreover, identical in camera and most machines, the film is in continual motionyet not momentarily viewed; for it is rendered opticallystati
Living pictures; their history, photoproduction and practical workingWith a digest of British patents and annotated bibliography . 159. MASKELYNE S MUTAGRAPH. This instrument is of interest not only from its greatsuccess at the Egyptian Hall, but also on account of theextreme ingenuity displayed in its construction. It isfounded on purely optical principles, which had beendimly foreseen by Clerk-Maxwell (see page 26). Theaction is, moreover, identical in camera and most machines, the film is in continual motionyet not momentarily viewed; for it is rendered opticallystationary by means of the drum L^, composed of PRESENT-DAY APPARATUS. 147 concave lenses as seen in Fig. i6o. The continuouslymoving film is caused to pass in front of a drum, L^,which is geared with the film drums, so as to move withthem, and this drum consists, in effect, of a series oflenses, say, concave, which are fixed edge to edge in a-suitable frame. Inside the drum are placed twostationary lenses, in a frame M, in the line of the optical-axis, the curvature of one or both of these lenses. Fig. i6o. corresponding to that of the lenses on the drum. Onthe outside of the lens drum is the projecting lens orobjective, while the source of light and the condenserare behind the film. The effect produced is as follows:Each successive picture on the film, in passing acrossthe field of view, coincides with one of the lenses onthe drum. The light passes through the picture onthe film, thence through the corresponding lens nearestto it on the drum, the two fixed lenses, and the corre- 148 LIVING PICTURES. Spending lens on the other side of the drum, and then-through the objective, reproducing the picture on thescreen. When any particular picture is central withthe optical axis, the faces of the various lenses will beparallel, and act as a piece of plain glass or a simplelens, and the light suffers no deviation from its the parts move, the refracting surfaces changeposition, an
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectmotionpictures
