An apparatus in the form of a current-loop controller driven by the EMF in the loop without the need for external power operates devices connected in the loop (in series) within the current operating range.
A personal flotation device is configured and sized so that it is adapted to be positioned beneath a person's body to cause the person to be suspended in equilibrium in a partially-submerged state. The device includes a ring-shaped body and a plurality of side floats extending radial
