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Title: An Osram machine feeder's test, a 'ball dropper' with red co [Go to resource]
Description: An Osram machine feeder's test, a 'ball dropper' with red cotton bag of marbles of two different diameters, and a pencilled sketch, probably made at NIIP, 1920-1940. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: mechanical aptitude test Temporal: 1920-1940 Source: Science Museum Identifier: 1994-1255/6 Go to resource More Like this...
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