Abstract: A radio central station alarm system including a central station and a plurality of remote stations for transmitting alarm signals to the central station by means of radio signals. Alarm signals are transmitted repeatedly in a sequence which reduces the probability that signals transmitted by one remote station will be completely obscured by signals transmitted by other remote stations. A pulse position modulation binary data format is used which simplifies both remote and central station apparatus and facilitates error-free data transmission. The central station is highly immune to noise and performs a number of tests on received data signals to reduce or eliminate false or erroneous alarm indications. Latching alarm sensor circuits are provided for use at the remote stations to insure that all transmission sequences are completed. Protective circuits are provided for disabling any remote station which transmits signals for longer than a maximum allowable transmission interval.

Abstract: The invention relates to means for establishing an equalized pressure across the insulating sheath of a hot isostatic press system. Tubes are positioned in the outer, insulation portion of the sheath to provide a substantially resistance free passage between a source of high pressure gas input to the system and the upper portions of the sheath. The invention also tends to reduce convection currents in the furnace chamber.

Abstract: In a multizone electrical furnace the phase shift effect of the thyristor devices used to control the power supplied to each thermal zone is reduced by providing two or more heater circuits, each including a thyristor device and a heating element, for each thermal zone. The thyristor devices are controlled so that only one thyristor device associated with each thermal zone is operating to produce a substantial phase shift at any time. Over-powering the heating elements at higher furnace temperatures may also be prevented by connected two or more heating elements associated with a thermal zone to one of the thyristor devices associated with that zone above a predetermined threshold temperature.

Abstract: A hot-food transporting box made of a semi-rigid material having top, back, bottom, and side panels attached to each other by fold line segments. The box also includes a multi-lamina front panel, which panel includes a first lamina extending downwardly from and attached to the top panel and a second lamina extending upwardly and attached to the bottom panel. When the box is erected, one of the front laminas is outside of, overlying, and releasably engaging the other lamina and the inside front lamina contacts the bottom or top panel to which the outside front lamina is attached, thereby retarding the sagging of the top panel of the box due to heat and moisture generated from the hot food contained therein. The inside front lamina is attached by a fold line segment to the front edge of one of the bottom and top panels.

Abstract: In a pilferage detection system employing apparatus for generating a magnetic field of alternating polarity and predetermined fundamental frequency through which articles subject to pilferage must pass to leave a protected area and a magnetic marker associated with each article in the protected area, markers are provided which generate both odd and even harmonics of the fundamental frequency in response to the alternating magnetic field when the marker is active (i.e., a control element of the marker is magnetized) and which generate only odd harmonics of the fundamental frequency when the marker is inactive. The presence of an active marker in the alternating magnetic field is therefore detected by detecting a predetermined even harmonic of the fundamental frequency. Apparatus is also provided for demagnetizing the control element of the marker associated with an article authorized for removal from the protected area to permit that article to pass through the alternating magnetic field undetected.

Abstract: An expandable chuck for rotatably supporting a longitudinal roll, such as a tissue supply roll for a folding machine, having a hollow cylindrical core. Pneumatically inflatable tube members are mounted on spaced wheel members, which are in turn mounted on a cylindrical sleeve rotatably mounted on a support shaft. The tube members are pneumatically interconnected and the chuck is fully controllable from either end for insertion in or removal from the core of a roll by valve and vent means adjacent each end of the chuck.

Abstract: The disclosed invention describes an apparatus and method for bringing a system having high interactive portions to a predetermined temperature distribution. The invention includes a difference controller which provides, through two separate drivers, a fixed total amount of energy to the system being controlled. If the system being controlled also has a long cycle time, second and third temperature controllers may be used to bring the system to the equilibrium temperature with a minimum amount of overshoot. The invention is particularly advantageous when used in connection with a high pressure, high temperature vessel useful in growing quartz crystals.

Abstract: Apparatus for finish casting of bifocal ophthalmic lenses from plastic material is described. No further surface grinding or polishing of the lens is required. The portion of the bifocal segment of the lens may be adjusted to any desired location relative to the optical center of the distance field of the lens. The apparatus comprises a power mold having a predetermined spherical or sphero-cylindrical surface, a bifocal mold having a predetermined optical curvature with a bifocal segment having a different optical curvature countersunk in the face thereof, and an annular gasket coupling the power and bifocal molds. The bifocal segment is adjusted relative to the optical center of the cast lens by use of a wedge member. An illustrative calculation to determine placement and thickness of the wedge for a given ophthalmic prescription is set forth.

Abstract: .Iadd. 1.