Abstract: A combination fireplace enclosure and heat-exchanger unit for providing supplemental heat to areas external to the fireplace. The unit includes an enclosure frame having double-paned glass closure doors, and a steam-heating system disposed at the upper portion of the frame. The heating system comprises a boiler device mounted at the rear of the frame and above the fire, and a heat-exchanger device disposed at the front of the frame. The heat-exchanger device has a steam passage which is connected by a steam line to the boiler. The passage is sloped with respect to the horizontal, such that condensate from the exchanger device can flow by gravity back to the boiler device to be converted into steam. The entire system is vented to the atmosphere whereby there is no danger of pressure build-up; accordingly the need for relief valves is obviated. Means providing an inlet to the system enable measured quantities of water to be added periodically, as required.

Abstract: A combination fireplace enclosure and heat-exchanger unit of the retro-fit variety, for providing supplemental heat to room areas external to a fireplace, comprising an enclosure frame having closure doors, and a series of elongate heat-transfer members carried by the frame and constituted of relatively high thermally conductive material such as aluminum, disposed side by side, and having portions extending rearwardly from the frame in a position directly above the fire so as to absorb heat therefrom. Other portions of the members extend forwardly through an aperture in the frame and terminate as a series of spaced-apart radiating fins of relatively large expanse and disposed at the front of the frame. Air from the room is thus heated by these fins, through conduction and radiation. A ventilating hood is provided, to partially conceal the fins and shield them from inadvertent contact with personnel in the room.

Abstract: A fireplace enclosure comprising a frame having two vertical side members and two transverse cross members extending therebetween, folding doors for closing off the space encompassed by the frame, and a pair of chain-operated, collapsible wire mesh screens. The screens slide along aligned rods having looped or bent connecting portions. The loops in the rod enable the screens to overlap an extent when closed, and also provide a simple guide for coextensive portions of the chain, without the need for complex channels or additional chain guide mechanisms.

Abstract: A steam-type fireplace heat-extraction apparatus, including an enclosure for utilizing the heat generated in a fireplace, comprising an isobaric or atmospheric, superheated steam system combined with a unique enclosure, said enclosure comprising a fireplace frame having vertical side members and horizontal top and bottom members, with two novel door structures which are hingedly carried by the fireplace frame. Each door structure comprises double panes of tempered glass disposed in spaced, parallel relation, held by a door frame which extends around the peripheral portions of the panes and confines the same. The door frames have special ventilating holes located adjacent the top and bottom members of the fireplace frame, which enable air from the room to be drawn into the space between the panes and then discharged, to not only provide heat to the room but also at the same time hold the temperature of the glass to a lower value.

Abstract: A gauge for monitoring the height of liquid contained in a storage tank or the like, comprising a channel-like structure having a first elongate probe element constituted as a circuit board having a conductive strip running for a substantial length therealong, an additional upright probe element also constituted as a circuit board, coextensive with the first and also having a conductive strip running for a substantial length therealong, and an elongate member disposed along the boards and constituting a spacer for maintaining the conductive strips of each of the elements in substantially parallel relation. Means are provided for mechanically connecting the boards to the spacer, with both probe elements being adapted for immersion in the liquid being gauged.

Abstract: A fireplace enclosure comprising a frame having two vertical side members and two transverse cross members extending therebetween, two pairs of hingedly connected folding doors for closing off the space encompassed by the frame, and a pair of slide latches connected with elongate slidable handles on two of the doors respectively for conveniently selectively latching and releasing the doors from the frame. The frame includes a door stop in the form of a depending apron on the upper cross member, constituting a backing for the doors when they are in closed positions. A pair of retainer slide members is carried on the innermost two doors, respectively, for engagement with the rear surface of the apron to prevent the doors from swinging freely outward as they are opened or closed. The arrangement is such that both the unlatching and the opening of each door pair can be readily accomplished by a single movement of the handle carried by one of the doors of the pair.

Abstract: A device for indicating the presence or absence of liquid at a single level in a tank, comprising a sealed cylindrical housing having one end wall permanently fixed and the other end wall removable. The housing has an internal shoulder against which the removable wall is seated. The latter has an annular recess extending about its periphery in which there is disposed an O-ring, adapted to sealingly engage the housing wall adjacent the shoulder and thus effect a watertight seal therewith. The removable wall is connected to the fixed end wall by means of draft screws and sealing nuts, the screws having spacers which mount two printed circuit boards in spaced relation with one another inside the housing. The removable end wall also carries at its outer side two concentric, conductor tubes on feed-through insulators, constituting a probe whose conductive or capacitive characteristics vary according to whether the tubes are submerged or dry.