31.031 SOUND PROOF TESTS, Science Service Historical Image Collection

1937 - sound proof room for testing motors, note the operator using the decibel meter

SOUND PROOF TESTS

CD 1966062 E&MP31.031

Electric Motors

Nov. 1937

Sound proof room for testing of special motors.

Note the operator using the decibel meter. The motors are coupled to a machine (located outside the room) to simulate actual operating conditions for the noise testing.