according to the invention includes a first arrangement wherein the elevator comprises an endless conveyor in the form of a rotatably mounted rigid wheel 48 having a circumferential rim portion provided with a plurality of barriers 50 forming pockets arranged for receiving a mass to be elevated in particular transmission 46 contemplates using a particulate or bulk material as the mass m 39 which is elevated by wheel 48 as same is rotated about a substantially horizontal axis by a for example rotary engine which is not shown but can be similar to engine 16 the second arrangement of transmission 46 includes a chute 52 arranged for forming the requisite guide path leading to a rotor 54 that can be connected in a suitable manner to a power producing machine not shown that can be similar to generator g and the like a baffle 56 in the form of an arcuate plate is arranged adjacent rotor 54 which is mounted for rotation about an axis parallel to wheel 48 and includes a plurality of compartments receiving the masses m 39 such that the latter discharged from rotor 54 will be deflected downwardly into the pockets formed by barriers 50 which barriers open inwardly toward the axis of rotation of wheel 48 and cause masses m 39 to be again elevated upwardly to the uppermost portion of the circumference of wheel 48 where they will be.