Abstract: A fire fighting trainer is provided for use in training firefighters comprising a series of lower profile burner tray assemblies which are fully self-contained for holding water which shields the tray structure from the high temperatures generated during the training exercise. A distribution system is provided to distribute and diffuse the propane above the water with a pilot igniting system for igniting the propane. The tray assemblies are covered by a metal netting which further shields them from the elevated temperatures and provides a walking surface over which personnel can advance during a training exercise. The low profile enhances the realism of the fuel spill fire and minimizes any hazards resulting from tripping on the surfaces.

Abstract: In accordance with the invention, a mask is produced of high quality and accuracy. This is accomplished by reducing the nominal writing scan width, relative to the total scan width, in an electron or optical beam raster scan pattern generator, and overlapping the adjacent scans by the difference between the writing scan width and the total scan width. When a pattern feature of small size overlaps into adjacent scan areas, the width of the writing scan is increased so the pattern area is within the increased writing scan area. In the case of a large pattern area with only a small portion extending into the adjacent scan area, no increase in the writing scan length is made.

Abstract: This invention relates to a portable exercise device for resistance type exercises of all muscles which make up the buttocks, including the gluteus maximus, gluteus minimis, gluteus medius and the piriformis muscles by both hip extension and hip abduction without undue stress on the spine and corresponding musculature. The device has a generally horizontal extending base, a headrest affixed to the base, a resistance bar for pressing against the underside of the thigh of the user which is pivotal to the base. Biasing means is provided for urging the resistance bar to a vertical position with a force which the user can overcome by moving the leg and thigh downward and for moving the resistance bar to a horizontal position. Biasing means is also provided for exerting a force to resist outward movement.

Abstract: A safety device for use in an escalator or moving walk for detecting stuck objects. A fine high-strength flexible wire is positioned through all the comb teeth and the skirts. A stretching of the wire triggers an electrical switch which in turn causes a relay to stop operation of the escalator or moving walk. Once this device is activated, only manual resetting will again activate the movement of the escalator.

Abstract: A liquid pilot assembly for use in an outdoor fuel spill fire fighting trainer is provided. This assembly includes a spark plug igniter unit, a liquid fuel system, an air distribution system, a housing enclosing the components and a vaporization subassembly disposed within the housing for changing liquid fuel to vapor fuel.

Abstract: An ignitor unit for an aircraft fuel spill simulator having an ignitor sparkplug without an air gap, a closed end cylinder having a top end wall with a hole receiving the ignitor sparkplug and having a peripheral wall with an inlet branch connection, a fuel line having an orifice element with a plurality of outlet holes disposed near to the ignitor spark plug, and an air line having an outlet orifice disposed adjacent to the ignitor sparkplug for allowing the blowing of air on the outlet orifice.

Abstract: A heat exchanger inner spiral-ribbed tube made of a hard metal such as stainless steel, titanium, or an iron-nickel alloy, and method of manufacture therefor for use in making a heat exchanger. The tube has an annular wall having an inner ribbed surface and an outer waved surface. The inner surface has a plurality of inner spiral ribs, each having a spiral angle. The spiral angle is about 18 degrees in the described embodiment. The tube-making method includes multiple steps in forming the outer waves and inner ribs simultaneously, progressively increasing the rib height while continuously pulling the tube in an axial direction.

Abstract: A fire fighting trainer is provided for use in training fire fighters and passenger rescuers during aircraft simulated cabin fires and simulated landing gear fires and during simulated oil spill module fires. The trainer includes a mockup aircraft, a mockup fuel spill module, a liquid fuel and vapor fuel supply system, and a fire control system. A method of training fire fighters and passenger rescuers is also provided.

Abstract: A heat transfer tube for use in a refrigeration evaporator. This tube includes an outer surface with axially spaced bent fins which form and enclose annular tunnels. The bent fins have top edge portions which have peripherally spaced sets of notches of different sizes on the same fin convolution and refill gaps for fluid flow to the tunnels for heat transfer through the annular wall. The concept of placing different pore sizes next to each other on the same fin allows a more efficient use of the tube's surface area for evaporative heat transfer.

Abstract: A public telephone having an anti-theft front wall assembly is provided. The public telephone includes a housing having a front wall, a face plate fixedly attached to the front wall at the exterior thereof, a key pad attached to the front wall at the interior thereof, key pad actuators being behind the front wall and actuator stem portions extending through aligned stem holes in the face plate, the stem portions and holes having reduced diameters so that web portions between stem holes are wider and stronger.

Abstract: An antifoaming agent is deposited on a stirring or straw element to be placed in a beverage receptacle. The disposition of this material on the element speeds up the pouring process and is useful in high volume environments, such as airliners, convenience stores, and college bars. The preferred material for the antifoam coating is DOW CORNING.RTM. Antifoam FG-10, which is a ten percent active, food grade silicone emulsion.