Abstract: A bow string stabilizer bar is telescopically carried by a bracket attached to a bow. The bar carries at its end remote from the bow a bow string clamp and handle assembly and a flexible element, whose length is adjustable, limits the extent to suit an individual archer to which the bar can be telescopically extended and hence the extent to which the bow string can be retracted preparatory to shooting an arrow. The stabilizer bar restrains the bow and bow string to move in a relatively fixed plane each time the string is retracted for shooting an arrow, thereby vastly increasing the accuracy of the archer.

Abstract: An impeller for frictionally heating liquid is arranged that upon rotation thereof in a liquid reservoir, liquid is forced from the exterior of the impeller through passages having restricted orifices therein to an inner outlet cavity closed on one side and having an axial opening on the other. The impeller not only heats the liquid due to the shear friction of the liquid with its outer surface, but the liquid flowing through these passages is further heated as it is forced through the orifices. The impeller serves both as a friction heater and a pump to circulate heated liquid through an outlet port in the housing to a heat utilization device and back to an inlet port.

Abstract: Liquid friction heating apparatus includes a pump rotor and an impeller rotor in a liquid reservoir. As the pump and impeller are rotated they impart frictional heat to the liquid. Further, the pump at all times delivers liquid to the inlet of the impeller which impells the liquid through restricted orifices to further heat the liquid. The pump positively prevents cavitation and ensures a constant flow through the orifices.

Abstract: A heating system of the portable, installed or other type in which the heat source is an apparatus in which a body of liquid is heated by friction produced in the liquid by a rotating body immersed in the liquid and the heated liquid is supplied to a heat exchanger, the heating system being made efficient and successful by relations between its parts and by reduction of the time spent in the heater exchanger by the heated liquid.

Abstract: A heating system is provided in which a rotor is rotated within a body of liquid within a chamber to heat the liquid by friction, and the liquid is conveyed to a heat exchanger and then returned to the liquid heater. The rotor chamber of the liquid heater is surrounded by a jacket chamber to which cooled liquid passes from the heat exchanger and in which it is heated by convection from the rotor chamber and from which it passes to the rotor chamber.

Abstract: A heating system using two liquid heaters of the immersed rotor type is provided for supplying heated liquid to a heat exchanger, and the liquid heaters are alternately connected to and disconnected from the heat exchanger so that the disconnected heater will produce superheated liquid.