Upper grip 3 for test piece 4 comprises a frame joining pistons 5 and 6. Cylinder 8 is connected to one pump, cylinder 9 to another. Pulsator 7, serving to apply a variable load, is connected by a pipeline to cylinder 8. When crank 1 rotates about fixed axis A, link 13, connected by turning pairs E and F to crank 1 and to rocker arm 11, oscillates the rocker arm about fixed axis D. This oscillation is transmitted through roller 12 to plunger 2 of pulsator 7. The pulsator is set up manually by means of shaft 10.
$3940$LHP,M$