Abstract: A leakage test apparatus and method whereby a test part may be tested for leaks using either a dynamic flow method or a pressure decay method. The apparatus includes an air supply and first, second and third conduits arranged in parallel with each other and extending from a first manifold pipe connected to the air supply to a second manifold pipe connected to the test part. The first conduit is adapted to fill the part with air from the air supply at a high flow rate, the second conduit includes a flow restriction orifice and is adapted to fill the part at an intermediate flow rate less than the high flow rate of the first conduit and the third conduit includes a flow meter adapted to measure flow from the first manifold pipe to the second manifold pipe during flow through the first conduit in a fill mode of operation and is further adapted to measure flow from the first to the second manifold pipe during flow through the second conduit in a stabilize mode of operation.

Abstract: A device which seeks to maintain itself in a predetermined temperature region in a body of fluid having various temperature regions as the fluid displacement volume of the device is automatically varied with temperature. The device is particularly adapted for fishing, as a bait or lure or the like is maintained within or vertically oscillates through a predetermined temperature layer or stratum in a large body of water, such as a lake or ocean or the like. However, the device may have numerous other uses in which it is desired to maintain an instrument or the like in liquid of a given temperature in a body of liquid having regions of various temperature.