(a) It is an object of this invention to provide test apparatus having a hydraulic velocity reducer. Such apparatus makes possible a compression test at low velocity with sufficient available energy,
although it uses a small mass as a source of that energy. Moreover, since the energy is furnished by a falling weight of low mass, the impact or force applied to the test specimen can be accurately reproduced
for a series of repeated tests.
(b) It is a further object of this invention to provide a test apparatus in which the force applied to the test specimen is indicated on an oscilloscope or is recorded on an oscillograph.
(c) Yet another object of this invention is to provide a compression testing apparatus having a trigger or starting circuit which allows the beam of the cathode ray tube to flow when the weight is dropped,
so that the cathode ray tube is made operative although the beam is not normally flowing.
(d) Other and further objects of this invention will readily be apparent to those skilled in the art, or can be learned by a reference to the annexed drawing and specification.