Abstract: A cover having the form of a bell with double wall and space between the walls, for maintaining the cooking temperature of food, which is placed over a burner of a kitchen stove or the like and which prevents the hot air from escaping from the vicinity of the burner, forming a first chamber which maintains a substantially uniform temperature therewithin and with a second enveloping chamber formed by the double wall, which also admits hot air around the lower edge passing into the space between inner and outer wall thus increasing the efficiency of the conservation of heat within the inner chamber, which permits rapid cooking of the food with the use of less fuel or heat.

Abstract: Cryogenic vessels having improved insulation value are prepared by incorporating evacuated tubing within the insulation.

Abstract: Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10.sup.3 ohm.sup.-.sup.1 cm.sup.-.sup.1, it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.

Abstract: Rotary closed Rankine cycle cooling and heating apparatus utilizing a single fluid for both engine power and refrigeration. The apparatus includes a rotary housing containing a boiler, power fluid expander coupled with a refrigerant fluid compressor and a refrigerant expander. A condenser for the expanded power portion and the compressed refrigerant portion of the single fluid, and an evaporator for the expanded refrigerant fluid portion, are mounted at respectively opposite sides of the housing coaxially thereof for rotation with the housing as a unit. The power fluid expander is driven at a predetermined speed by pressure power fluid vapor generated in the boiler and in turn drives the refrigerant fluid compressor. The refrigerant expander is of the capillary type constructed and arranged with respect to the evaporator to automatically control the capacity balance of the refrigerant system.

Abstract: This invention relates to an electrolytic treatment drum of the type suspended by a drive pulley.This drum comprises a double-flanged wheel in which passes the suspension and drive belt, this drum comprising an inwardly opening door, of which the axis is fast with an arm provided with a catch, which, during rotation, is pushed by the belt into one of two notches according to the direction of rotation, opening or closing the door.

Abstract: A system for recovering and condensing vapors from a liquid process or storage tank in which a shell is connected to the tank for receiving the vapors from the tank, and a vortex tube is adapted to supply a stream of cold air into said shell. The cold air is passed in a heat exchange relation to the vapors in said shell to condense the vapors, and the condensed vapors are passed back to the tank.

Abstract: A double felted dryer arrangement wherein a web to be dried is held between the felts and guided onto the surface of a foraminous dryer roll whereupon the outermost felt is guided away from the dryer and directed over a hot air blower mounted over the now exposed web carried on the innermost felt on the dryer shell surface. The hot air blowing on the web is complimented by an opposed vacuum chamber within the roll shell to promote improved through air drying web and web stabilization.

Abstract: Cadmium stannate has been found to be useful as a window for solar heat absorbing systems in which advantage is taken of the unique optical properties of cadmium stannate. When cadmium stannate is in an electrically conductive state, having a conductivity of greater than 10.sup.3 ohm.sup..sup.-1 cm.sup..sup.-1 , it becomes transparent to solar radiation and reflective of thermal infrared radiation. This enables the cadmium stannate to function as a window which allows passage of solar radiation through it and incident onto a black body, and at the same time serve as a reflector of thermal infrared radiation emitted from said body. This results in more efficient solar heat transfer to the solar heat collector provided with such a window.

Abstract: A fume hood is provided with a plurality of removable enclosure panels which cover various components of the hood to which access is necessary from time to time. The panels which must be removed most often are each removable independently of the other panels, and the fasteners for all of the panels are hidden.

Abstract: A high pressure gas tank has its output closely connected to the input of a Joule Thomson cryostat. When the tank is permitted to discharge its gas, Simon cooling of the inlet gas to the cryostat decreases the time to cool down at the cold point in the cryostat.

Abstract: A centrifugal refrigeration unit which comprises a rotatable shaft carrying two spiral tubular assemblies, one on each end. Each assembly comprises two spiral tubes. At one end the assembly acts as a condenser, and at the other end as an evaporator. Means are provided for directing separate streams of air across the condenser and evaporator assemblies. Numbering the spirals from the condenser end as first, second, third and fourth, and considering the rotation of the shaft clockwise as seen from the condenser end, the first spiral expands outwardly from the shaft in a counterclockwise direction. The second spiral expands outwardly from the shaft in a clockwise direction. The third expands in a counterclockwise direction, and the fourth expands in a clockwise direction. The shaft is hollow and the small ends of the first and fourth spirals are connected through the hollow shaft.

Abstract: Liquid refrigerant is injected into the high-pressure side of a rotary compressor so as to cool the refrigerant being compressed to allow it to be useful in cooling the compressor motor. The injection port is located on the bottom face of the compressor chamber, within an area removed from the compressor chamber wall, immediately adjacent the compressor chamber discharge. The feed to the injection port is through a larger tube containing two non-connected capillaries, the first capillary being connected to the inlet of the tube and the second capillary being connected to the injection port. In this manner, a column of liquid remains in the second capillary.