Abstract: The present invention relates to an arrangement equipped with a motor and a transmission device for the winding of those cameras provided with a winding shaft which is accessible from the outside and which is designed to be rotated until its movement is arrested by a first locking device in the form of a tensioning lock, which after exposure of the film, will once more release the winding shaft. Included in the transmission device is a spring which is tensioned by the motor whilst the camera is being tensioned and which, once tensioning of the camera is complete, is kept under tension under the effect of both the tensioning lock of the camera and a second locking device contained in the arrangement in the form of a rewinding lock. The arrangement also includes a switch which, once tensioning is complete, that is to say with the tensioning shaft in the position in which it is locked against further rotation by the tensioning lock, will interrupt the power supply to the motor.

Abstract: A tractor having a wheel (15) on the end of each of a pair of pivot arms (13) having a comon central pivot axis (12). A hydraulic cylinder (16) is attached to each arm (13) intermediate the pivot axis (12) and the wheel (15) and to a centrally located bracket (17) on the frame located directly above the pivot axis 12.