Abstract: Heating for a vibratory spiral conveyor used to react powdery and gaseous substances is accomplished by an expanded metal resistance heater element positioned between adjacent turns of the conveyor.

Abstract: A carrier for circuit elements comprises a frame member of insulating material having terminals embedded in it. These terminals have interior portions for connection to circuit elements mounted within the carrier and exterior portions emerging from opposite sides of the frame member in a single plane. Two housing caps are mounted on the frame member to enclose it and the circuit elements.

Abstract: An electromagnetic relay is disclosed comprising within its coil bobbin a magnetic core, the ends of which extend substantially at right angles to the longitudinal axis of the bobbin so as to form pole shoes projecting from the coil bobbin and having mutually aligned pole faces and further comprising an armature which is disposed externally of the coil bobbin between the pole shoes of the magnet core and which is pivotally mounted for rotation about one of its centroid axes, said one axis extending perpendicularly to the longitudinal axis of the bobbin. Contact terminals are disposed on both sides of the longitudinal axis of the coil and are positively located by embedment in a contact carrier, the coil bobbin and the contact carrier extending substantially over the entire length of the coil bobbin and being provided with engaging means for the mutual positioning and retaining of the contact carrier and coil bobbin.

Abstract: An assembly of fuel cells, enclosed in a container, is immersed in a tank holding the electrolyte. Operating gas is used to produce electrolyte circulation through the cells.

Abstract: A structural arrangement is provided for an electromagnetic relay having an armature, coil means, contact means including contact terminals and fixed contacts, and a coil holder body having the armature located therein and being composed of two substantially exactly interfitting and interconnected parts. One part of the coil holder body is formed as a contact holder with the contact terminals and the fixed contacts embedded therein. The other of the two parts of the coil holder body is formed as a cover member configured to at least partly define a contact containing chamber for the relay structure. Alternatively, the two parts of the coil holder body may be formed to essentially consist of two identically constructed contact holders.