Abstract: A solar deep well steam pump has a solar collector, a steam boiler in the collector's focus, a deep well bladder pump having an actuating tube and a water delivery tube, and a mechanism periodically injecting steam under pressure from the boiler into the actuating tube of the bladder pump, the mechanism having an expansion chamber connected to the actuating tube of the bladder pump, a long period pendulum swinging by gravity to a first position, a steam injection valve between the boiler and the expansion chamber, the steam injection valve being opened by the pendulum in the first position, an impulse bladder connected to the expansion chamber so that steam pressure in the expansion chamber inflates the impulse bladder against the pendulum in the first position to urge the pendulum against the force of gravity toward a second position, an exhaust valve leading from the expansion chamber to the atmosphere, the exhaust valve being opened by the pendulum in the second position, the injection of steam into the ex

Abstract: The invention relates to star-shaped magnetic circuit elements. Such elements can be obtained by manufacturing a tore-shaped magnetic circuit element by winding a magnetic sheet strip around a pin. Then this tore-shaped element is pressed by converging equidistant pressing means. The obtained star is adapted to receive electrical coil bobbins on each of its legs and is accordingly adapted for constituting the core of a symmetrical star-shaped transformer.