Improvements in Slide-Film Projectors

Due to the considerable increase of interest in, and the use of, slide-film projectors of all sorts for educational and commercial purposes, a symposium on the subject was held at the Chicago Convention of the Society on April 30, 1936. Following are three of the papers presented in the symposium, and the joint discussion that followed two of them.

Print ISSN

0097-5834

Published

1936-10

Content type

Information

DOI

10.5594/J14746