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18 SYNOPSES TRANSACTIONS No. 13 A Point Light Source for Laboratory Use C. A. B. HALVORSON, JR., AND S. C. ROGERS The term "point light source" is purely hypothetical and un- attainable but one approaching this definition has been developed and found to be practical from a laboratory standpoint. The use of this lamp and a comparison of the intrinsic brilliancies of this and other lamps is presented. p. 48 Industrial Mechanigraphs HARRY LEVEY Answering the demand of a public educated to continually ex- ' pect something better in the way of motion pictures, the ani- mated mechanical drawing was developed, a drawing which moves in the same manner as the machine or whatever else was represented, and which has now given way to the more advanced "mechanigraph," differing from the animated mechanical drawing in the engineering skill behind it, in the refinement of details, and care and thoroughness by which it is made. An interesting illustrated discussion is given of the subject matter and versatile application of the mechanigraph. p. 55 Analysis of Motion C. P. WATSON Following a short history of the development of the "Novagraph" camera, various uses of "Analysis of Motion" or slow motion photography are outlined. p. 65 100,000 Pictures per Minute C. FRANCIS JENKINS Information upon many important problems can only be obtained by photographic divisions of time at a high rate, and therefore the development of high speed photography is very worth while. Many difficulties were met; a discussion of these and their sub- sequent remedies is given. p. 69 The Use of Artificial Illuminants in Motion Picture Studios LOYD A. JONES A general treatise outlining the fundamental relations between the various factors of the problem which divides itself into two main parts: a consideration of the characteristics and response of photographic materials to the radiation of various intensities and qualities emitted by the light sources available; and the human eye, its characteristics and the possibility of injury to any part resulting from extreme intensities or the quality of radiation emitted by the sources used.