F. H. Richardson's bluebook of projection (1935)

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ACKNOWLEDGMENT It is with keen appreciation that 1 make note of the courtesies and cooperation shown me during the prepara tion of this, the sixth edition of the BLUE BOOK OF PROJECTION, Jjy the engineering and executive personnel of various equipment manufacturing companies to which I had recourse for specific information and for accuracy of data. As a result of this cooperation so willingly and promptly extended I have every assurance that this BLUEBOOK is not only complete in all the essential details of motion picture projection and sound reproduction but also that it is, by and large, an accurate presentation of what is becoming, almost daily, a more difficult subject and a more exacting profession. To the following companies, for numerous conferences and for making available photographs for reproduction herein never before privileged for publication, I make grateful acknowledgment : National Carbon Company, Bausch and Lomp Optical Company, International Projector Corp., Enterprise Optical Manufacturing Company, Electrical Research Products, Inc., RCA Manufacturing Company, Hall and Connolly, Inc., Brenkert Light Projection Company and Strong Electric Corporation. I also extend appreciative acknowledgment to tinfollowing individuals whose expert advice helped me materially: Edgar R. Wagner; A. H. Kopprasch; J. E. Heney; William N. Douden; George Dobson and Herbert Griffin. Aaron Nadell, my collaborator, joins me in this acknowledgment. F. H. R.