Abstract: A water heater using the heat pump principle includes a hermetic compressor mounted within a well defined within a water tank. The outlet fitting of the compressor is connected to a condensing tube within the tank that heats the water. The compressor includes a radially outwardly projecting flange that is supported on a support surface on the upper header of the water tank through a resilient pad. The pad includes ribs, dimples, or other projections to partially support the flange away from the surface of the pad and/or to support the pad off of the support surface on the header, to thereby vent the volume defined between the compressor and the well.

Abstract: Input videos from a multiple beam radar system are processed beam by beam first threshold devices which are weighted in accordance with signals from all the beams, and then the signal has to pass one of two further threshold devices before being processed as a target indication. One of the additional threshold devices is biased by all adjacent beams of the beam being processed; and the other threshold device is biased by weighted factors of the adjacent beams. The weight being dependent upon whether the beam is a near adjacent beam or a diagonally adjacent beam.