Abstract
Special slide-changing projectors were designed and built for the Kodachrome exhibit in the Eastman building at the New York World's Fair. Eleven machines are synchronized so that panoramic scenes one hundred and eighty-seven feet long may be shown. Indexing of the slides is controlled by notches in a sound-film so that the entire program is automatic. — The slides in each machine are arranged in two rows, and the machines each have two gates and two complete optical systems. All the slides in one row are rigidly bolted to a ring-gear forty-eight inches in diameter. For each new picture one of the two ring-gears is spring-indexed into a new position. An optical compensator geared to the ring-gear corrects for any inaccuracies in indexing, and the image is optically “dowelled” on the screen.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
