Abstract: A two-terminal electronic thermostat connectable in series with an electrical heater and a source of AC power and selectively providing AC power to the electrical heater, and a power supply incorporated in the thermostat for providing DC power to the control circuitry of the thermostat, includes a relay connectable in series with the electrical heater, a control circuit for selectively actuating the relay, an ambient temperature sensor and a potentiometer for setting a set point temperature. The power supply includes a current transformer having its primary winding connected in series with the relay and the electrical heater. The power supply also includes a first bridge rectifier circuit, a second bridge rectifier circuit connected to the secondary winding of the current transformer and a capacitor divider network formed from first and second capacitors and providing a desired DC voltage to the control circuit. The first capacitor is coupled to the first bridge rectifier circuit.

Abstract: An elongated spar is attached longitudinally to cross-members interconnecting the hulls of plural-hull sailing craft, which spar projects forward to provide points of attachment for the forestays and headsail tacks of the sailing craft, whereby the forces exerted by the forestays and headsail tacks are removed from the bows of the hulls of the sailing craft and employed to oppose mast downthrust forces, substantially reducing the load on the hull-interconnecting structure. If applied to existing sailing craft the danger of hull breakage is eliminated and danger of hull-interconnecting structure failure is greatly reduced. The forward projection of the spar may be fabricated to cause a controllable lateral deflection of the luff of the headsail, to vary the airflow through the slot between the headsail and a mainsail. Similarly, an aftward projection may be employed to control mainsail sheeting angle and to make the mainsail self-tending when the sailing craft tacks.