Abstract: A gas compressor or blower having a piston rod 88 carrying pistons 162, 173 working within cylinders 161, 172. The piston shaft is driven to rotate and reciprocate so that each piston rotates and reciprocates in its respective cylinder, ports being provided to allow induction and after compression exhaust the gas from each cylinder during such movement. Each cylinder comprises a plurality of circumferentially adjoining sealing segments (such as 203, 204) supported from bridge pieces (such as 104, 106) by adjusting bolts (such as 114, 123). Each segment can be set independently of the others relative to support plates (101, 103) so that the clearance between the inner surface of the segment and the confronting surface of the piston is sufficiently low to limit axial leakage between the piston surface and the segment surface without the need for any piston ring and to limit leakage to or from respective ports form in certain of the segments both axially and circumferentially of the piston.

Abstract: A set of golf clubs, including both woods an irons, is disclosed in which the various clubs are constructed in their various parameters to aid the user to insure that each and every swing of the club follows the correct path and also to resist rotation of the club head and shaft during impact with the ball about a variety of pivot points on the shaft to assure that the ball will travel in a true flight pattern. The club head is weighted to locate its center of percussion near the toe of the head to reduce rotation of the head at impact about the shaft axis and the handle of the club is weighted to locate the center of percussion of the club below the club head to reduce rotation of the club about the pivot point defined by the base of the index finger of the lower hand in the grip.