The Sheet-of-Water Fountain Brush: Tapered Slots Part the Bristles

Water dribbled onto the back of a brush stays in the bristles and never reaches the surface being washed. Frank L. Brinn of Milwaukee received US 840,604, patented 8 January 1907, for a fountain brush in which "the fluid may be delivered to the longitudinal central portion of the brush in a sheet, which when the fluid is turned on at full head will serve to separate the bristles and flush the surface to be washed": slots through the block narrow toward the bristles, fed from a cylinder on top through a tubular handle, with a cup on the handle to catch what runs down. This rung works out how the taper speeds the sheet, then cuts the slots in a scrub brush, plumbs it and compares full flow with throttled flow.