Abstract: A high efficiency heater system made up of a longitudinally extending combustion chamber located within an external enclosure which is spaced apart from the combustion chamber to provide an air space. A burner assembly provides combustion gases into one end of the combustion chamber which travel down the chamber and are exhausted through flue gas vents at the other end of the chamber. An air path divider separates the air space between the upper portion of the combustion chamber and the enclosure from the air space between a lower portion of the combustion chamber and the enclosure. A blower supplies ambient air which flows into the upper air space, flows along the hottest part of the combustion chamber and then, upon reaching the flue gas end of the combustion chamber, reverses direction and travels back along the lower air space before being exhausted into the ambient air.

Abstract: An automatic enclosure nest for domestic fowl includes automatic controls for controlling the entrance and exit of fowl to and from the nest and for controlling the retrieval of eggs laid by the fowl from the nest. The nest enclosure also includes a trap mechanism that prevents more than one fowl from entering a nest and includes an automatic trap reset mechanism for moving the trap mechanism to an open position after accidental closure of the trap mechanism.

Abstract: An elongated plural nest section for a poultry nesting system providing nests arranged as a plurality of like modular sections. Each section is an elongated enclosure providing the nests with front access openings. A lifting at a rear edge portion of the nest bottoms that collectively raises all the nest bottoms about a front axis from a lowered laying position to an elevated upwardly tilting expulsion position to eject poultry from the nests. A nest access controlling wire gate/trip for the access opening of each nest to be swung downwardly from a first open position to a blocking second during passage of a hen into the nest. A time controlled motor and cable arrangement swings the nest bottoms concurrently to an upwardly titled expelling position and returns the gate/trip assembled to the said first positions.

Abstract: A forced air convector and heating fireplace grate structure formed of an array of substantially C-shaped hollow tubes arranged in parallel vertical planes providing a forwardly facing concave cradle for supporting burning logs or other fuel. A motor driven fan and an associated plenum transversely spanning the array of tubes and communicating with the lower inlet ends thereof provide a pressurized appropriately distributed air supply to the tubes to effect heating of the air in the tubes by the burning fuel and achieve forced discharge of the heated air in predetermined directions back into the room.