. Transactions of the Society of Motion Picture Engineers (1921) . Packard Campusfor Audio Visual Motion Picture and Television Reading Recorded Sound Reference TRANSACTIONS OF THE SOCIETY OFMOTION PICTUREENGINEERS CONTENTS PAGE Officers 3 Committees 4 Membership List 7 Extracts from By-Laws 13 Presidents Address 15 The Illumination with Large and Small Condensers. By W. E. Story, Jr 19 Optical Glass. By H. N. Ott 39 A Point Source of Light for Laboratory Use. By C. A. B. Halvor- son, Jr., and S. C. Rog


. Transactions of the Society of Motion Picture Engineers (1921) . Packard Campusfor Audio Visual Motion Picture and Television Reading Recorded Sound Reference TRANSACTIONS OF THE SOCIETY OFMOTION PICTUREENGINEERS CONTENTS PAGE Officers 3 Committees 4 Membership List 7 Extracts from By-Laws 13 Presidents Address 15 The Illumination with Large and Small Condensers. By W. E. Story, Jr 19 Optical Glass. By H. N. Ott 39 A Point Source of Light for Laboratory Use. By C. A. B. Halvor- son, Jr., and S. C. Rogers 48 Industrial Mechanigraphs. By Harry Levey 55 Analysis of Motion. By Chas. P. Watson 65 100,000 Pictures per Minute. By C. Francis Jenkins 69 The Use of Artificial Illuminants in Motion Picture Studios. By L. A. Jones 74 Actinic Measurements on Exposure and Tinting of Motion Picture Film. By W. E. Story, Jr 106 Need for Improvement in Present Practice as Regards Film Reels. By F. H. Richardson 116 The Protection of Inventions. By Thomas A. Howard 123 Testin


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