Abstract: What is disclosed is a physical exercise apparatus including two barbell disc carrying carriages each of which is independently, freely moveable along a pair of vertical rails upon each of which it is mounted by a pair of widely spaced outboard bearings. Each carriage is provided with an inwardly projecting stub shaft to which one end of a lift bar may be affixed by means of a sliding collar, thereby adapting the apparatus for barbell exercises. A plurality of captive cables is provided whereby the respective carriages and their associated barbell disc weights may be used to provide the resistance for different physical exercises executed simultaneously by different persons employing the same apparatus.

Abstract: Methods are discussed for treating liquid and particulate radioactive waste materials for transportation and storage. The disclosed methods include the reading of an ohmmeter connected across a pair of separate and mutually insulated liquid level sensing electrical contacts arranged to contact the surface of a mixture of radioactive waste materials and a setting agent when a container is filled to a predetermined level with that mixture and determining from variations in the resistance between the sensing contacts the time when the mixture is solidified. The disclosed methods also include the flowing of a coating material such as the setting agent unmixed with the radioactive material over the surface of the solidified mixture after the resistance between the sensing contacts reaches a maximum and then causing the coating material to harden and produce a surface free of waste water.

Abstract: An engine synchronizer for synchronizing the speed of a slave engine with the speed of a master engine is disclosed. The disclosed synchronizer includes a comparison and control circuit deriving input signals from the distributors of two engines, e.g., the two engines of a power boat, one engine being arbitrarily designated the master engine and the other being arbitrarily designated the slave engine. The throttle of each engine is coupled to its associated hand throttle lever by means of a Bowden cable. One end of the sheath of the slave engine throttle control cable is attached to a slidable bracket. The slidable bracket is positioned within its limits of sliding movement by a positioning motor operating through a rack and pinion. Power to energize the positioning motor is supplied by the comparison and control circuit.