Assertion: overhead projector | /r/ObjectUse | used as controllable blackboard
Facets:
value: in the teaching of writing
type: TEMPORAL
Source sentences:
text: The overhead projector, used as a controllable blackboard or bulletin board in the teaching of writing, extends the range of teaching techniques so that an instructor may (1) prepare, in advance, handwritten sheets of film--test questions, pupils' sentences, quotations, short poems--to be shown in any order or form; (2) use pictures, graphics, or cartoons as subjects for creative composition; (3) write comments on a prepared text or a pupil's composition transferred to film; or (4) create diagrams or symbols to aid in the discussion of a composition.