Abstract: A flotation trampoline adapted for use on a body of water comprising a non-elastic, collapsable encasement having a symmetrical configuration. The base cover is attached to a perimeter on the lower, interior tube surface and is adapted to seal off a rapid air or water flow through the tube opening to thereby create a substantially closed volume between the base cover, lower interior tube surface and the water surface upon which the tube is placed. A resilient cover is attached at the top of the encasement to provide a trampoline spring mat.

Abstract: A ground isolation monitoring apparatus having a protective circuit is provided for use between an AC power source and a utilization device, such as an electronic instrument. The protective circuit permits operation of the utilization device with earth ground disconnected, automatically reconnecting earth ground if a hazardous voltage or current appears on device chassis or exposed metal parts. The protective circuit also monitors neutral-to-earth ground continuity and shuts off AC power to the utilization device if the ground path opens or if the impedance thereof increases. Various other features may be provided to ensure safe operation of the device.