Fig. 1 shows the motor with all its parts in side elevation, the flywheel and head rest being in section. Fig. 2 is a side view, with the air reservoir and distribution valve in section through the line 1-2. Figs. 3 and 4 represent the same apparatus, but without support, as where it is to be used on the table of a sewing machine, with the crank of the motor directly fastened to the flywheel of the sewing machine. Fig. 5 is a plan or horizontal section at the level of the line 3-4, and Fig. 6 is a section passing through the same line, but only including the cylinder and axis of the distributing valve. Fig. 7 is a horizontal section of the button of the cock through the line 5-6 of Fig. 3. Finally, Fig. 8 shows in detail, plan, and elevation the arrangement of the starting valve. [Illustration: Figs. 1 through 8 IMPROVED OSCILLATING HYDRAULIC MOTOR.] This little motor does not show any new principle. It uses the old oscillating cylinder, but it embraces in its construction ingenious details which render its application very simple and very easy, especially, as we have already said, to sewing machines. In the first place, the oscillating bronze cylinder, A, is cast in one piece with the distribution cock, _a_, Fig. 3, and its seat, _b_, also of bronze, is adjusted and fastened by means of the screw, _b_, to the air reservoir, C', cast with its cistern, C, acting as foundation or bed plate for the motor. This cistern is held either on the base of the cast iron bearing frame, D, of the main shaft, _d_, _d_, Figs. 1 and 2, or directly on the sewing machine table, Figs. 3 and 4, by means of two pins, _e_ and _e'_, so that it can oscillate about an axis which is perpendicular to the shaft, _d_, to which is attached the disk, F, carrying the crank. This arrangement of parts, in combination with the horizontal axis of the distribution valve and with the piston rod, _g_, considered as a vertical axis of rotation, forms a species of universal joint between the crank pin and the table, so that it can be put in place without adjustment by any workman, who only has to screw up the two screws, _h_, to fasten to the table the standard, E, and the piece, E', in which are screwed the pivots, _e_ and _e'_, which support the tank, and this all the rest of the motor. As is seen more clearly in Fig. 2, the water under pressure enters by the pipe, _c_, to which is attached a small tube of India rubber, and leaves by the pipe, _c'_, and is carried away by another India rubber tube.