Abstract: A torque calibrator allowing the accurate calibration of impact type wrenches. The calibrator measures the displacement of a heavy fixed beam in its natural oscillation mode. The beam has a long period of natural oscillation and an elastically soft segment preventing generation of rebound signals sometimes seen in stiff systems.

Abstract: A method of testing the hardness of a circular tablet is presented and comprises holding the tablet on edge between two members respectively on opposite sides of the tablet, transmitting a controlled pressure to the tablet through one of the members, transmitting from said tablet through the other of said members to a pressure gauge and recording the maximum pressure on the gauge up to the moment that the tablet breaks. Apparatus is presented including a frame holding a source of pressure fluid, communicating said fluid to a pressure cylinder mounted beneath a tablet to be tested which is supported in a vertical position on edge, having the fluid pressure cylinder beneath the tablet and having a plunger in contact with the upper side of the tablet and connected with a load cell and pressure transmitting means with a pressure indicating gauge, all of this above the tablet.