Abstract: The turn tilt table is preferably mounted on a self propelled mobile vehicle for carrying a test article such as a military vehicle weighing up to 70 tons. The mobile vehicle is driven to a plurality of test sites at which radar beams or the like are directed against the test article for determining vehicle radar signatures or the like. During testing, the turn tilt table may be tilted anywhere between a horizontal position and 45.degree. from the horizontal; and may be pivoted 360.degree. about an axis normal to the plane of the turn tilt table to any of a plurality of positions within 360.degree.. If vehicles are being tested, a ramp is connectable to the table to allow the vehicle to be driven onto or off the table.

Abstract: The multipurpose vehicle of the present invention is designed to operate in and around dry docks and wharfs and its capable of lifting and moving propellers from propeller shafts within areas confined by a ship's rudder and to carry the propeller to an area away from the ship to be lifted to the wharf by crane. The propellers may weigh as much as 75,000 pounds and be 23 feet in diameter. The vehicle may also be used to accurately position keel blocks and haul blocks weighing up to 25,000 pounds in positions to support a ship. The vehicle may be lifted by crane out of dry dock to test padeyes for safety and certification by applying up to a 50,000 pound pulling force to the payeyes. The vehicle's upper arm can be extended to about 40 feet high or can be lowered to a level permitting the vehicle to pull or carry articles into buildings on the wharf.

Abstract: Apparatus for mounting on a crane or other construction equipment for detecting the presence of an electrical power line. A reference pickup coil mounted on an upper machinery works or other portion of the equipment generates a reference signal proportional to the strength of a magnetic field in a work area. Other pickup coils mounted on a crane boom or other portions of the equipment which may extend into closer proximity to power lines develop signals which are compared with the reference signal. When any of these signals exceed the reference signal by a predetermined amount a warning signal is developed. Coils having the proper ratio of core length to diameter and having coil winding which extend along approximately half the core length provide output signals which have a predictable amplitude.