A foreshortened log periodic antenna includes variously configured dipole elements which are arranged in four regions along the axis of the array. The first region includes a series of solid, triangular dipoles characterized by substantially constant base/height ratios. The second region similarly includes a series of solid, triangular dipoles. However, these elements are characterized by decreasing base/height ratios so as to afford a gradual transition into the third region, which includes a s...

A tandem fan for a motor-vehicle radiator has one fan impeller driven via a fluid friction clutch by the engine shaft. Both fan impellers have belt pulleys with a common driving belt. Overrunning clutches for the two fan impellers ensure the impellers are driven by the drive shaft which is running faster.

In a presently preferred embodiment of this invention a spacecraft includes at least four thermal radiator panels, with a first pair of said panels being initially stowed along a North facing surface of said spacecraft and a second pair of said panels being initially stowed along a South facing surface of said spacecraft. Each of said panels is coupled to a hinge mechanism at an anti-Earth facing end of said spacecraft and is rotatable by said hinge mechanism from a stowed position to a deployed...

A printed antenna comprises a window formed in a grounded conductor provided on one surface of an insulator substrate, a first strip conductor formed in the window, and a second strip conductor provided on the other surface of the insulator substrate.

Infrared-radiating equipment having ceramic radiators and reflectors. Any desired number of uniform reflectors are hinged to each other at their longer sides and articulated with bearing bolts. Enough radiators to attain the desired heating effect are accommodated next to each other in a common reflector. The radiators are preferably rod-shaped or rectangular.

A battery system for an body stabilized satellite traveling in a geosynchronous orbit comprises east and second battery modules and similarly facing radiators for discharging beat to deep space. Heat conduction arteries connect each battery module to its associated radiator. An east thermal switch is operable for thermally connecting the first battery module to and from the east facing radiator. Similarly, a west thermal switch is operable for thermally connecting the second battery module to an...

A loudspeaker has a rigid sound radiator having a free edge and a electromagnetic drive mounted on an opposed hub edge and arranged to produce a torque on the radiator. Either a coil or a permanent magnet of the drive is mounted directly on the hub edge and has a radius which is substantially smaller than the radius of the radiator.

A part to be assembled is maintained applied by an edge having a continuous contact line with another part to manage a capillary interval, a liquid flux is deposited only on the outer side of the parts so that the flux wets only a very small height of the inner wall, the aqueous support of the flux is evaporated, then heating is performed up to the melting temperature to melt the brazing film which is drawn up through capillary action only by the flux wet portions.

A drain pan for radiators and cooling systems includes a base panel which is molded or otherwise formed into a coffer shape defined by upstanding side walls extendings continuously about the perimeter of the base panel. The side walls include an inwardly extending shoulder spaced slightly above the base panel to support a grid formed of a plurality of upwardly extending panels. The upstanding panels are equally spaced and oriented parallel to perpendicular axes to form a rectilinear matrix. The ...

The invention relates to a manually setable, knob-type thermostatic control assembly for radiator valves. The knob normally has a fixed or usual setting to provide a desired temperature for a room. Occasionally the setting is temporarily changed for one reason or another and the unit must be reset to its usual setting. This is facilitated herein and in the prior art by providing index markings on the relatively rotatable members. The novelty herein, however, is in providing a cap for the rotatab...