Abstract: A reversing gear connecting a gas turbine to a propulsion shaft includes a big-diameter first gear wheel rotatable with the propulsion shaft and two pinions meshing therewith. There are further two intermeshing gears, one aligned with each of the pinions. One of the pinions has a through bore, permitting the passage of the output shaft from the turbine, a two-way clutch between this first pinion and its aligned gear, to connect, at will, last mentioned gear to the output shaft, or said shaft to the first pinion, the other pinion and its aligned gear being permanently interconnected.

Abstract: Exhaust gas is sampled from an internal combustion engine operated disconnected from the transmission elements, thus braked by its inertia and internal losses only.Before running the test it is important to find out the positions, at which the fuel supply means ensures idle running and maximum fuel supply, respectively. A monitoring device is designed to find out these positions, and then to run a test cycle between those positions. The monitoring device may include means for running, prior to the actual test, a short conditioning program at the engine, to ensure that the same has attained a desired normal temperature, when the test starts.