Abstract: A drive by means of an electric motor for trackless vehicles, in which the rotational speed adjustment takes place by changing the field energization of the electric motor, and with a separating clutch connected behind the motor as well as a change-speed transmission having at least two speeds in the foward driving direction; an energizing current controller for the field winding is provided whose energizing current-desired value is predetermined by another current controller to which are fed, on the one hand, the actual value of the armature current and, on the other, a desired value which is determined by the drive and/or brake pedal when the separating clutch is not actuated, and which is automatically determined by a synchronizing controller or is set to zero during the actuation of the separating clutch.

Abstract: A process for the operation of rechargeable zinc electrodes in galvanic cells with the aid of a residual discharge, which comprises subjecting the rechargeable zinc electrode in a cell after a normal discharge to a residual discharge by connecting with at least one auxiliary electrode within said cell.

Abstract: A drive system for electrically driven vehicles in which an electric motor is adapted to be driven from a driving battery which is adapted to be switched by means of a switch from partial voltage to full battery voltage; an electronic control system is provided which acts on the switch as well as on the excitation of the motor and is controlled by the motor rotational speed, by a driving pedal and by a brake pedal; the electric motor then drives a hydraulic torque converter which is interposed between the electric motor and the driven wheels.

Abstract: A hydrogen diffusion diaphragm for selective separation of hydrogen from hydrogen-containing gaseous mixtures, which comprises a body of a titanium-alloy of more than 50 molar percent of nickel exhibiting a diffusion coefficient sufficient to allow permeation of the hydrogen through the diaphragm. The diaphragm is produced by mixing nickel and titanium in such proportions that the resultant mixture contains more than 50 molar percent of nickel, by forming the mixture into an alloy and by shaping the alloy into a diaphragm.