Abstract: A method of killing roaches and ants by using an insecticidal composition consisting essentially of a mixture of boric acid, sugar, condensed milk, and an aqueous liquefier.

Abstract: A rotary wavy motion type engine is disclosed, and the engine includes: a center housing 1 and side housing 2,2'. The center housing 1 is provided with an exhaust hole 1', and the center and side housing form a frame and an internal chamber. A disc shaped piston 4 having supporting 4a,4b is supported within a pair of arcuate recesses 2', 2a' of the side housings 2,2a. An inclined eccentric shaft 3 is rotatably secured to the disc shaped piston 4, and the other end of the shaft 3 is connected to an output shaft. The disc shaped piston 4 defines left and right chamber 5, 6, and nutation members 23,23' are attached upon and under the disc shaped piston 4 in such a manner that they should define an intaking compressing room 8 and a pressure releasing room 9. All of the above components are arranged in such a manner as to produce twisting wavy motions in the disc shaped piston.

Abstract: An air compressor having a tilting disc which is actuated in waveform. The tilting disc is adapted to abut mounting the disc on conical surfaces of side casings by an eccentric shaft, and is moved in waveform but not rotated against the rotation of the eccentric shaft so that the intake and exhaustion of air may be realized.