title: An optoelectronic slide identifier.
abstract: 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.
mesh_terms: D000043:Abstracting and Indexing; D001296:Audiovisual Aids / Q000295:instrumentation*; D004581:Electronics / Q000295:instrumentation; D008027:Light