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Thomas, P.H. and Nash, P., 1955. A COMPARISON OF THE CONVENTIONAL AND THE "WIDE-COVER" TYPE OF SPRINKLER. Fire Research Notes 154
This report describes tests comparing the performance of the "wide-cover" type of sprinkler developed by the Factory-Mutual Laboratories of the United States of America, and sprinklers of conventional design. The tests included measurements of water distribution, and of ability to control a spreading fire beneath both plain and joisted ceilings. While reports of tests on fires in high stacks of materials have: shown a superiority of the "wide-cover" type of sprinkler in extinguishing the fire, the tests reported here showed them to be scarcely the equal of conventional-type sprinklers in dealing with a fire at ground level when operating at the minimum acceptable water pressure. The "wide-cover" type, used singly, was not so effective in controlling a fire directly beneath it, mid in one case it is doubtful whether the sprinkler could be deemed to give adequate cover in this respect.
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