Page:Federal Reporter, 1st Series, Volume 4.djvu/343

 BIEBEKT OYIi. Olli OUP CO. V. HAEPEB ITJBRIOATOB 00. 329 �the end of the cylinder, and serves as a gauge to indicate the position of the piston at the end of the cylinder. On the oppo- site side of the piston head is an opening, to which is con- nected a vertical pipe, between which vertical pipe and the cylinder is a three-way cock Connecting with cylinder, vertical pipe, and discharge pipe. At the opposite end of the cylinder is a pipe, furnished with a cock, leading to a point at which the lubricating material is to be delivered. On the top of the cylinder is a feeding cup, likewise furnished with a cock for pouring in the lubricant; likewise, on top of the cylinder, is a small cock for allowing the air to discharge when the lubri- cant is poured in. The operation of this machine is as foUows : �"The piston being pushed to the rear end of the cylinder, the lubricant is poured in to fill it upon the front side, or that which ia furnished with the pistou-rod. The pipes at the two ends of the cylinder are supposed to be submitted to an equal pressure from the steam. The vertical pipe at the rear end of the cylinder becomes fiUed with water from the condensed steam, the hydrostatic pressure from which, as it enters the cylinder, pushes the piston forward and expels the lubricant. On the rear side of the piston there is steam pressure adde.d to the hydrostatic pressure of the water which condenses in the vertical pipe. On the front side of the piston there is the pressure only of the steam and the atmospheric pressure upon the small area of the piston-rod, which serves as a gauge, This makes an excess of pressure upon the rear, due to the hydrostatic column in the vertical pipe, which presses the piston forward and drives out the lubricant through the dis- charge pipe." �The claims of the re-issue are as f oUows : �"First. The arrangement of a cylinder, A, provided with & piston, B, and pipe, N, substantially as described, whereby the lubricant is fed by means of hydrostatic pressure or steam pressure, or both. �"Second. The cylinder, A, pipe, N, and cooks, G and H, ar- rangea substantially as described, whereby the lubricant may be fed by hydrostatic pressure. ����