Abstract: A low power electrical heating device for use in inhibiting the condensation of moisture in the housing of a piece of electrical equipment has an electrical resistor adapted to be connected to the main current circuit encased in an outer cover of thermally conductive material, the cover having a flat surface at one portion of its exterior periphery. A finned heat radiating body of thermally conductive material defines another flat surface and supports the resistor. The heat radiating body has its flat surface in flush engagement with the flat surface of the resistor for direct heat transfer from said resistor to said heat radiating body.

Abstract: A protective cabinet has four upright and hollow polygonal-section posts formed of a fiber-reinforced polyester and spaced at corners of a rectangle. Four respective upright walls between the posts each have a rigid and rectangular inner panel, a rigid outer panel identical and parallel to the inner panel, an annular rim joining the outer edges together and projecting annularly inward past the inner panel, and a mass of insulating material between the panels and within the rim. The rim engages at its outer face between two respective posts and the panels have parallel and spaced outer edges. Respective rigid equipment-supporting channels lie inward of the inner panel against the rim on its inner face opposite each respective post. Fasteners such as screws or rivets secure the channels through the rims to the respective posts, thereby also securing the respective wall to the respective posts.

Abstract: A flat plate of thermally conductive material, such as aluminum, has mounting holes for connecting it on one side on a support and on the other side to an instrument which is to be thermally stabilized. The plate is internally traversed by a heating wire and is recessed near one of its edges to provide a platform on which temperature-sensing control elements such as a thermostat, a heat limiter and an alarm indicator can be positioned in close proximity to the wire. The platform is encased by a housing in which these elements and their connections are embedded in synthetic potting resin.

Abstract: A synthetic resin (plastic) housing resistant to corrosive environments and especially adapted to receive electrical or mechanical devices or components, consists of two parts which are joined together with an interposed seal. According to the invention, the two parts have different depths so that each of the parts can be stacked with others of like kind and both of the parts are provided with mounting elements for the selective disposition of the electrical devices or units thereon which transmit force to a support for the housing without stressing the latter.

Abstract: For generating control pulses for timing gasoline engine ignition, a rotor of magnetically conducting material with one or more notches in its edge cooperates with a stator also of magnetically conducting material having the configuration of a shallow U, of which the extremity of one leg presents a broad area to the narrow air gap between it and the edge of the rotor and the other leg presents essentially a knife edge. A magnet is mounted on the former leg and a pick-up device, such as a Hall generator, field plate, inductive winding or a reed switch is provided on the other leg to produce an electric signal in response to changes in magnetic flux. The passage of the notch by the broad area foot of the stator produces at most an insignificant change in flux, whereas passage of the notch by the other stator leg produces a sharp change in flux and hence a control pulse.