Abstract: A battery connector clamp has a cooperating pair of solid lead jaws having abutting inner ends that clampingly encircle a battery post and having grooved outer side surfaces to seat the parallel shanks of a U-bolt with the threaded ends of the shanks being engaged by nuts so as to secure a clamping bar against the outer end of one jaw and in clamping cooperation with the bight portion of the U-bolt which is seated in a groove in the outer end of the other jaw that has a bore to receive the bared end of a conductor cable.

Abstract: An apparatus for purification of waste water in a tank or a pool has a housing rotatably journalled on a raft and provided with pump means to force air and water therethrough. The housing contains first discs having central holes and a second discs having peripherical apertures at the wall of the housing. Each disc forms a baffle for air and water flows through the housing, thereby imparting a tortuous path to the air and water passing through the housing. The discs are corrugated and are arranged in a stack with the corrugations of adjacent discs oriented at right angles. The corrugations strengthen the discs and form support points at which the discs contact each other, and also define channels between the discs, through which channels of water and air can flow. A spiral pump rotating with the inlet end of the rotor forces metered volumes of water and air through the rotor.