Abstract: A granular biomass burning furnace for use with any appropriate granular biomass, such as grains, cherry pits, etc. The furnace includes a three stage heat exchanger, a fuel injector, a fuel stirrer, an ash ejector, a wash down system, a three stage air inducer, a fuel igniter, and supporting components. The unit includes a computer controller which controls all aspects of the operation of the unit based on information from sensors located throughout the unit. The unit includes a smart logic thermal controller to adjust the output heat of the unit via a variable speed air inducer. The three stage heat exchanger system includes a spiral water jacket surrounding the burn pot, a plurality of heat exchanger baffles in the unit, and a fine finned heat exchanger at the top of the unit. The air inducer provides air to the burn pot from three directions to promote complete combustion.

Abstract: A telephone includes a lamp pivotally mounted to the telephone housing. An inductive pick-up detects an incoming call on a telephone line and actuates a switching device to energize the lamp if the ambient light level adjacent the telephone is below a predetermined level as determined by a photosensor on the telephone housing. After disconnection of the call, a time delay circuit de-energizes the lamp after a predetermined time interval. The ambient light level at which the lamp will be illuminated and the time delay between call disconnection and lamp shut-off are programmable by a user. A manual override switch allows activation or deactivation of the lamp independently of detection of an incoming call or the ambient light level.