Transactions of the Society of Motion Picture Engineers (1916)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1916
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Society of Motion Picture Engineers : incorporation and by-laws (1916)
Leaf #:
00094
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
December 28, 2023
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REPORT OF COMMITTEE ON ELECTRICAL DEVICES H. M. WIBLE, Chairman W. G. KUNZMANN H. A. GAMPE MAX MAYER J. G. MOULTON ROBT. P. BURROWS The Committee on Electrical Devices have made an investigation of the various forms of converting equipment for use in operating D. C. arcs from A. C. mains and submits for your approval the following report, which intends to show the characteristics and advantages of each of the forms. Information has not yet been secured on all of the devices on the market and this report, therefore, does not include the entire list. The ultimate purpose of such an investigation is to determine the principles by which the selection of apparatus for any installation may be made. Briefly summarized, the data submitted by the several manufacturers result in the general principles stated below. Owing to the lack of data, it has been necessary to limit the recommendations for application to Mercury Arc Rectifiers and Motor Generator Sets, but it is probable that the same considerations applying to the Motor Generator Sets will apply to Rotary Converters in a general way. Either type of equipment will give satisfactory service when properly installed and cared for as directed. The question as to which piece of apparatus should be adopted should properly be determined by the local conditions of the individual application. The arc current required is determined by : (a) Dimensions of screen (b) Length of throw (c) Reflective value of screen (d) Intensity of general illumination (e) Angle of projection (f ) Type and densitv of film. Information to be taken into consideration in selecting one equipment where either may be applied is listed below : (a) There is a difference in over-all efficiency between the Motor Generator Set and rectifier.