Abstract: A noise generator is created by having a high pressure gas applied to a Mach 2 nozzle which is combined in an adjustable nozzle assembly with a resonance tube of adjustable length with a closed end forming a Mach disk between them. The resultant compression and expansion shock wave oscillations exit the resonance tube and are propagated between reflecting domes which direct the generated noise around a test article in a housing which contains the generated noise. A muffler includes a water spray chamber and baffled bulkheads to dissipate the generated noise.

Abstract: A heat exchanger for an instant steam generator is disclosed comprising a small diameter, continuous metal tube formed into a closed, cylindrical helix. A heat source in contact with either surface of the helix such as a cartridge heater inserted into the helix generates steam in the water flowing in the tube. A set of thermostats in contact with each end of the helix permits fast turn on of the heater but prevents overheating and fusion of the output end of the helix.

Abstract: A can crusher having an upstanding stationary platen and an upstanding movable platen, the movable platen being reciprocated with respect to the stationary platen. Both platens are canted with their upper ends closer together than their lower ends so that, when a can is placed in the crusher with the can in contact with the platens, the platens trap and hold the can in the crusher and concentrate the crushing forces over a narrow portion of the can perimeter at the beginning of the crushing of the can resulting in a reduction in the total force required to crush the can.