An Osram machine feeder's test, a 'ball dropper' w
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. (Possibly BPS Inv. No. 0081a.)
- Psychology, Psychiatry & Anthropometry
- Object Number:
- mechanical aptitude test
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