Abstract: A new engine hoist transmission attachment for enabling an engine hoist to remove and install a transmission. The inventive device includes an adaptor portion coupling with an existing engine hoist. The adaptor portion includes a leveling arm positioned essentially parallel to a lifting arm of the engine hoist. A transmission stand is coupled with the adaptor portion and is adapted for supporting a transmission thereon. The transmission stand includes an upper plate supporting the transmission thereon.

Abstract: An impulse noise generator having means to store a volume of compressed gas and suddenly to release same to eject through a nozzle (14) comprising a body (4) having a hollow stepped piston (1) arranged to move forward by gas pressure admitted through an inlet (9) when a spring-loaded valve (15) is closed and including a pressure chamber (7) to which gas is admitted through the valve (15) when the piston (1) is at the forward and of its stroke, and gas release means to cause the piston (1) to move back rapidly to exhaust the gas from the chamber (7) to the nozzle (14).