An optoelectronic slide identifier.
An inexpensive optoelectronic slide identifier that uses binary code is described. It can be attached to most automatic projectors and provides for automatic indexing of up to two-hundred and fifty-five different coded slides, while each slide is being projectd.
D000043:Abstracting and Indexing; D001296:Audiovisual Aids / Q000295:instrumentation*; D004581:Electronics / Q000295:instrumentation; D008027:Light