SIEBERT OTIi. OIL CQP CO. V. HABPSB I.T7BBI0AT0B 00. S31 �pie was mamfestly the same as that revealed in the earlier patent, though the arrangement for its. operation was differ- ent." OarrattY.Siebert, 98 JJ. 8. 76. �After the patent of 1871 had been granted, the patentee sought and obtained a re-issue of the patent of 1869. The re-issue described the invention as follows: "My invention consists ina novel method of feeding the oil to the cylinders, said feed being accomplished by means of hydrostatic pres- sure, operating through devices substantially as herein de- scribed. In the general mode of feeding oïl to cylinders, the opening through •which the oil passes to the valves or other parts is the only point ■where the lubricant is exposed to the effect of the steam pressure, and the oil is subjected to constant ebullition, and an irregularity of feed is a necessary resuit. If steam can be applied on each side of the body of the lubricant, so as to produce a state of equilibrium, and then some constant and regularly-augmented power be brought into operation to disturb this equilibrium in one di- rection, the oil will be forced in that direction, and be sup- plied with a regularity depending upon the regularity of the augmentation of the power used to disturb the equilibrium of the steam pressure on the lubricant. One of the powers I use to disturb the steam equilibrium is a hydrostatic eolumn, formed by the condensation of steam in an extended pipe, to form one of the steam connections, to create the equilibrium before mentioned." �Again he says: "The steam, becoming condensed in the pipe, N, forms a hydrostatic eolumn behind the piston, and this eolumn, acting in conjunction with the steam in pipe N, overcomes the pressure from pipe M, and the piston is forced slowly and regularly in the direction of the arrow, thus giv- ing a constaïit and regular feed of the lubricant through the supply pipe, M, and the continued condensation of the steam regularly augmenting and supplyirig the hydrostatic eolumn." �The testimony shows that the active principle for expelling the lubricant from the cylinder is the hydrostatic eolumn in the vertical pipe, and that steam aîd's hydrostatic pressure to this small extent: "Upon the rear side of the piston the ����
