|Classroom record player|
Many film strips came with records so the operator would advance the film strip by one frame with each "ding." This would be explained on each and every record meant to run along with the filmstrips. I remember the voice explaining that: "At this point, you should be on the frame with the filmstrip title that says (for example): 'Adjectives, Describing Those Nouns.' If you are not on this frame, move forward or back to it at this time. During the filmstrip, you will hear some pings like this < PING > which will mean that it is time to advance the filmstrip by one frame. Lets try it now. When you hear the ping, advance the film strip. <PING!>. Did you advance the filmstrip? Well done!"
The techie kids were rewarded by the teachers and became AV Assistants (Audio visual assistants) who got to run the film strip projector (and the movie projectors which was a harder project). First, they would go down to the office and check out the appropriate AV cart, bring it upstairs in the elevator (reserved for teachers and special tasks), wheel it into the class, and run it.