English: Plan of the truck and the variable speed gear. Notes from original article:"The motor is located at A, and through a friction clutch B, and the variable speed gear C, it rotates the shaft 77, which runs lengthwise of the vehicle. Motion is imparted to the hind axle by means of bevel gears contained within the casing D. The large bevel gear on the axle is of the differential type, so as to drive the wheels H R at the proper velocities. When a high speed is desired, the variable speed gear, Fig. 10, is set so that shaft M drives N direct, the clutch at E being moved so as to interlock. N is the end of shaft //, so that with this connection the bevel pinion, which meshes into the axle gear at D, revolves at the same velocity as the motor shaft. By moving the handle V, Fig. 9, to the right, an intermediate speed is obtained, and by moving it to the left, the carriage is run at the lowest velocity. "When the handle V is turned to the right, the ends M and N, which form the clutch E, Fig. 10, are separated, and at the same time the lower shaft H is moved toward M, so as to cause gear 1 to mesh into gear 2, and also 3 into 7. By this means the end N of the axle-driving shaft is rotated through the train of gears 1, 2, 3 and 7. If the handle V is turned to the left, the shaft I is moved toward M, so as to cause gear 1 to mesh into gear 4, and gear 6 into 8, the latter being secured to end N of the axle-driving shaft. The speeds obtained by these changes are in the ratio of nearly 1, 2 and 4."