| 摘要 |
A fire hose nozzle of the high constant gallonage class positions a cylindrical stream pattern sleeve for reciprocal motion around and about a beveled discharge orifice in the nozzle which includes a centrally positioned baffle. A rotatable dial on the nozzle has a cam channel therein engaging a detent on the cylindrical sleeve for imparting reciprocal motion thereto, the cam channel being so formed that rotation of the same to predetermined positions locates the pattern forming sleeve so as to provide a straight stream, narrow fog or wide fog patterns as desired.
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