Shaft 1 with eccentric a is driven by an electric motor. Eccentric b is mounted on the hub of internal gear 3. Secured on shaft 1 is carrier 4 which mounts gears 5, 6 and 7, and auxiliary electric motor c. Levers 8 are hinged to lever 9. Upon rotation of shaft 1, test-piece 2 is subjected to a variable tensile load by means of levers 8, 9 and 10. The amount of displacement of the head of the test-piece and, consequently, the magnitude of the applied load, can be varied during operation by turning eccentric b by means of electric motor c. The amount of strain is measured by pickup d.
$819$LW,M$