Abstract: A water spray cooler with a pair of water collecting mesh structures and having a water spraying nozzle assembly disposed therebetween. Air entering the cooler is directed through the mesh structures and towards a cooler outlet port. The entering air is cooled as it passes through a cool water spray from the nozzle assembly and through the mesh structures which have collected water.

Abstract: A method of measuring fluid leakage around or through a barrier. In the preferred embodiment, the leakage measured was around a permanent mine stopping. To make the measurements a temporary test stopping with two windows was erected near the permanent stopping under observation. It is not necessary that the test stopping be leak-free. The first of the two windows has a known cross-section area and the second window also has a known cross-section area. To practice our invention, an anemometer is used to measure the flow through the first hole before the second hole or window is opened. Then the flow through this same window is measured when both holes are open. Next, the flow through the second hole is measured when both holes are open. Using these three measurements and the principles of fluid dynamics, the total leakage past the permanent stopping can be mathematically determined.

Abstract: The invention relates to a mine stopping for underground mines which may be readily mounted within a mine airway to form a gas-tight seal to control the flow of fresh air to the working face of the mine and the efficient exhaust of dirty gas laden air from the working face. The stopping is typically formed of a flexible, gas impervious, fire resistant sheet material provided with means for mounting the same within the interior of the mine. The mounting means embody inherent characteristics of permitting the main body of sheet material to separate from the mine interior walls upon the occurrence of a certain predetermined pressure difference between the opposing major surfaces of the main body of the stopping as may occur by a blasting or underground explosion. Thereby the main body portion of the stopping is not damaged and may be reused.