Abstract: A computer includes a main body casing which has a mounting opening, a peripheral unit which is mounted to the mounting opening, a supporter which supports the peripheral unit, a hinge which comprises a rotating shaft provided in one of the main body casing and the supporter to make the supporter rotate between a mounting position and an opening position of the main body casing, a shaft to support the other one of the main body casing and the supporter to be engaged with the rotating shaft, and a shaft guiding part which is extended from the shaft supporting hole and guides the rotating shaft to move the supporter from the opening position. The support of the computer is prevented from being rotated in an opening position and is detached from the computer without difficulty.

Abstract: A heat engine is provided with twin crankshafts and coil shaped power elements mounted between each of two crankshafts. Each power element moves upward and downward, parallel with the surface of a tank of hot water, in which the engine is partially submersed, so that every part of the power element is allowed to remain submersed in the hot water for the same time interval so as to achieve maximum rotating power.