Abstract: A method of and an apparatus for controlling a quantity of an explosive gas mixture to be used in treating workpieces with thermal and pressure shocks wherein a signal gas having a predetermined initial pressure is introduced into a workpiece treatment chamber of the apparatus for determining a volume of workpiece loaded into the treatment chamber by a pressure difference between the predetermined initial pressure of the signal gas and a filling pressure thereof, which pressure difference is representative of the volume of the workpieces in the treatment chamber, and metering of the explosive gas mixture is effected in accordance with this pressure difference.

Abstract: The set contains a central distribution box (20) having a plurality of severable electrical main terminals, for example connectable by a cable or by internal wiring to a distribution panel by, for example, a connector (22) or internal wiring. A plurality of identical adjacently located multi-terminal connection sockets (21) are located at the sides of the distribution box. The socket or receptacle terminals of the sockets (21) are internally connected to the main terminals by electrical connections on a conductor support plate.

Abstract: Instead of monitoring a thermal deburring operation by reference to whether a certain high temperature is reached and thereby indicting whether a successful ignition in the deburring chamber has taken place at every step of operation of the chamber, a circuit responsive to the rate of change of temperature is used to recognize a successful operation, thus permitting faster operation of the apparatus. Such a circuit is also useful for rapid detection of a short circuit circuit in electrochemical apparatus utilizing heavy electrical currents and variable amounts. In the latter case a digital circuit for measuring the amount of change at equal intervals of time is particularly useful.

Abstract: The high voltage between a rotary disk coating powder dispensing device and an electrically grounded article to be coated is maintained constant when the spacing between a spray disk at high potential and an article to be coated at ground potential is too great to permit a breakdown discharge, whereas at smaller spacings the current flowing as the result of transport of charged coating material is held constant, but when the spacing goes below a minimum value at which the energy stored in the disk device and in the wiring capacitance is sufficient to support a breakdown, the high-voltage supply is switched off, by short-circuiting the high-voltage transformer secondary winding. When the high-voltage supply is thus switched off, an acoustic or optical alarm is actuated to call attention to the necessity of restoring operation.