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Only One App

Only One App

Magic-Brain Calculator, purchased from a TV Guide ad in the 1970s. All it does is add and subtract things, but it does it without electricity, mechanically. It came with a stylus, but you can use a pen or pencil tip to slide the geared tabulators. When done, you zero it by pulling the handle at the top.

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( 1 comment — Leave a comment )
tilt_longtail
Jul. 29th, 2017 01:24 am (UTC)
WOW I think I had that
( 1 comment — Leave a comment )

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