A photographic transparency mounted in a frame, designed to be projected onto a screen for viewing.
Compound of 'film' (from Old English filmen, a membrane) and 'slide' (from Old English slīdan, to glide). Combined in early 20th century when projection technology emerged.
Filmslides were the Instagram of the 1950s—teachers would darken classrooms to show these individual images, creating a ritualistic moment of focused attention that we've lost in our endless digital scrolling.
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