Abstract: A system for the placement of modular fill material forming co joined assemblies that promotes increased efficiency in fill material building methods by utilizing the capabilities of aerial conveyance devices, the pre-assembly of forms, the rapid bracing of forms, and the sequential placement of enclosure forms.

Abstract: A transformer rectifier unit is provided for developing regulated DC output power from first and second sources of unregulated DC power. The transformer rectifier unit includes a transformer having a primary winding connectable to a source of AC input power and first and second secondary windings. The first secondary winding develops AC power at a first level and the second secondary winding develops AC power at a second level lower than the first level. First and second rectifier circuits are respectively coupled to the first and second secondary circuits for rectifying the AC power therefrom to DC power having corresponding first and second DC levels. A switch is coupled between an output of the first rectifier circuit and an output of the second rectifier circuit and is operable in first and second switching states to provide DC output power from one of the rectifier circuits to a load.