Abstract: Methods and apparatus for monitoring the compaction of soil material in a defined region include hammer structure for impacting soil material in the defined region, a sensor for disposition at the bottom of the defined region the includes a transducer for developing an electric signal in response to energy transmitted through soil material from the hammer structure, and a control module responsive to electric signals from the sensor for providing an indication of the quality of compaction of soil material in the defined region.

Abstract: Methods and apparatus for monitoring the compaction of backfill material in an excavation include hammer structure for impacting backfill material in the excavation, a sensor module for disposition at the bottom of the excavation to be backfilled that includes a transducer for developing an electric signal in response to energy transmitted through backfill material from the hammer structure, and a control module responsive to electric signals from the sensor module for providing an indication of the quality of compaction of backfill material in the excavation.

Abstract: An automated system for providing different services within a house includes an appliance coordination data network for communicating relatively low speed appliance digital data within a house, a high capacity data network for transferring high speed digital data within the house, an energy distribution system for distributing energy throughout the house, an analog services distribution system for distributing conventional analog signals throughout the house and a video services distribution network for distributing video services throughout the house. The appliance coordination network interfaces with the energy distribution system to control the flow of energy to appliances throughout the house responsive to a digital request or interrogation signal that is emitted from the appliance itself.

Abstract: An automated system for providing different services within a house includes an appliance coordination data network for communicating relatively low speed appliance digital data within a house, a high capacity data network for transferring high speed digital data within the house, an energy distribution system for distributing energy throughout the house, an analog services distribution system for distributing conventional analog signals throughout the house and a video services distribution network for distributing video services throughout the house. The appliance coordination network interfaces with the energy distribution system to control the flow of energy to appliances throughout the house responsive to a digital request or interrogation signal that is emitted from the appliance itself.

Abstract: An automated system for providing different services within a house includes an appliance coordination data network for communicating relatively low speed appliance digital data within a house, a high capacity data network for transferring high speed digital data within the house, an energy distribution system for distributing energy throughout the house, an analog services distribution system for distributing conventional analog signals throughout the house and a video services distribution network for distributing video services throughout the house. The appliance coordination network interfaces with the energy distribution system to control the flow of energy to appliances throughout the house responsive to a digital request or interrogation signal that is emitted from the appliance itself.

Abstract: An electronic constant speed control for a hydrostatic transmission having a variable displacement hydraulic pump with a displacement controlling member movable to various positions at either side of a neutral position and having an input shaft connectable to a prime mover and a hydraulic motor having an output shaft, an electric controller for positioning siad displacement controlling member, a command potentiometer for establishing a set constant speed signal representing a desired constant speed between zero and maximum speed in either direction of rotation for said output shaft, a speed detecting device for establishing a pump input shaft speed signal, a circuit for generating a position control signal representing the required position of the displacement controlling member for the set speed which is responsive to the constant speed and pump input shaft speed signals, a speed detecting device for establishing an output shaft speed signal, a circuit for comparing the output shaft speed signal with said se