An Osram machine feeder's test, comprised of a 'ball dropper' with a red cotton bag of marbles of two different diameters, with a pencil drawing showing the test set up, probably made at the National Institute of Industrial Psychology (NIIP), 1920-1940. (Possibly BPS Inv. No. 0081a.)
Wooden construction described as a 'ball dropper', part of an Osram machine feeder's test, probably made at the National Institute of Industrial Psychology (NIIP), 1920-1940. (Possibly BPS Inv. No. 0081a.)
Cotton bag containing marbles of two different sizes, part of an Osram machine feeder's test, probably made at the National Institute of Industrial Psychology (NIIP), 1920-1940. (Possibly BPS Inv. No. 0081a.)
Pencil drawing showing the set up for the Osram machine feeder's test, probably made at the National Institute of Industrial Psychology (NIIP), 1920-1940. (Possibly BPS Inv. No. 0081a.)
