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ons around the trunk, which enable it to be removed in lengths, the barker requires peeling-irons, which are thrust beneath the bark to loosen it. The operation is performed in spring, when the sap is abundant between the bark and the wood. Peeling-irons. Rossing is not the exact equivalent of barking, as the former is a grinding or cutting action (usually), the latter a peeling. See London's Encyclopedia of agriculture. Bark-grinding mill. Bark-grinding mill. Weldon's Bark-Mill, 1797, has a conical iron drum A provided with teeth, and rotating in a casing B, the upper part of which forms a flaring hopper. The casing and its contained grinder are supported by a framing F, and motion is given to the cone by a belt running upon a drum on the upper end of the shaft D, whose lower end is supported in a step or ink. A screw below the step affords means for adjustment of the cone in the casing, the faces of the two being toothed, so as to effectually rasp the bark as it p
the oil. On the return stroke of the pump, the shaft seats itself on the oil that has been forced under it; the oil returns back to the pump as it flows through the bearing. Unlike other systems of hydrostatic lubrication, this does not seek to keep the shaft in equilibrium; but, on the contrary, it keeps it in constant motion up and down, by the injection of the oil, aiming thus to secure a more perfect lubrication. Hydrostatic lubricator. It is stated that a step in Starr's Flour-Mill, at Vallejo, California, supporting a four-ton shaft making ninety-three revolutions per minute, has been run constantly, day and night, for seven months, with this lubricator, without changing the oil; and the oil, when taken from the reservoir at the end of that time, had not become thickened or discolored in any appreciable degree. See palier glissant. 4. (Ordnance.) An arrangement for lubricating and cleaning the grooves of rifled guns. In the English service it consists of a co