A plurality of perforated endless belts are disposed in circumventing relationship about a radiator. At least one roller is disposed on either side of the radiator to engage and guide the belts with one of the rollers being motor-driven. A vertically disposed guide bracket is mounted on the cooling air exit side of the radiator, intermediate the lateral sides thereof, to engage and guide the belts thereacross. An arcuate guide plate, having a plurality of holes formed therethrough, is mounted on...

A device for ventilating fluid radiators (5) and/or starting and braking rheostats (15) in a locomotive which is powered electrically, by means of an internal combustion engine, or by a combination thereof, said radiators and/or rheostats being disposed in a layer close to the locomotive roof (4). The device includes at least one tangential fan (8,9) having a horizontal axis which extends longitudinally relative to the locomotive and blowing air towards said radiators and/or said rheostats. The ...

A microwave oven having a rotating radiator supported on a conductor extending through an aperture in a wall of the oven. The radiator is made up of a plurality of separate radiating elements supplied with microwave energy from said conductor via separate strip lines. A conductor of each of the strip lines rotates with the radiator and with respect to a ground plane which is common to all the strip lines and is formed by the wall of the oven containing the aperture. The radiating elements simult...

To provide improved performance in a microwave antenna, particularly for use in a Doppler navigation system, rectangular arrays obtained from truncated slanted arrays are used to obtain beam shapes which exhibit a high degree of independence from over-water shifts.

A radiator for use in hot water central heating systems is constructed from extruded aluminium alloy sections. One finned configuration of section having a tubular duct extending therethrough is used as the heat exchanger which interconnects the fluid flow and return headers. These each incorporate locking flanges which interlock with respective external slots pre-formed in the fins on each side of the heat-exchanger sections. Pressure tight fluid connections between the headers and the duct in ...

Subject-matter of the invention is an overload protection and display circuit, in particular for operation in conjunction with high-power sound radiators, and including one or more protective circuits therein. Each circuit senses the real value of the electrical sign applied to their inputs. The moment of interference depends on the averaged real output of an adequately long memory period preceding the interference. Consequently the sound radiators may be operated controlled by an output conside...

A dipole array consisting of at least two dipole antennas mounted one above he other in a generally vertical plane, having respective pairs of radiating elements substantially aligned on a common generally vertical axis and being fed from respective radio signal sources by the respective feed lines directed along the common vertical axis through the various radiating elements and being configured to also include a cable choke section on either side of the lower antenna as well as a cable choke s...

A polarization insensitive lens is disclosed for receiving and reradiating electromagnetic energy, which may be either left-hand circular polarized or right-hand circular polarized or of any linear polarization or, in fact, of any polarization state. Each lens is comprised of a pair of spaced apart multiarm/antenna elements of opposite geometric polarization. The elements are located on opposite sides of a ground plane and spaced therefrom by 1/4 wave length. The arms of each antenna element are...

A method for coating vehicular radiators with an ozone depleting manganese oxide catalyst in slurry form utilizes a robotic arm with multiple spray heads for spraying the face of the radiator. Each head is in fluid communication with its own dedicated peristaltic pump. The pumps are independently valved into and out of fluid communication with select heads as a function of the spray pattern effected by robotic arm movement.

A multi-band radio antenna device (1) for a radio communication terminal, comprising a flat ground substrate (20), a flat main radiating element (2, 9) having a radio signal feeding point (3), and a flat parasitic element (5, 6). The main radiating 5 element is located adjacent to and in the same plane as said ground substrate, and preferably dielectrically separated therefrom. The antenna device is suitable for being used as a built-in antenna in portable radio terminals, such as a mobile phone...