Systems and methods according to these exemplary embodiments provide for a circuit 10 for switching from a first battery 12 to a second battery 14. The circuit includes: the first battery 12 configured to provide electrical energy to a device when a first ...

A method and apparatus for a rugged three-axis inclinometer 100 for determining an object's orientation with respect to a gravitational field. Components of the apparatus include but not limited to a magnet 110, a non-magnetic casing 102, 104, a ferrofluid...