Abstract: A telescopic mast is provided in kit form with stays wound on reels in a predetermined order. This order is such that when erecting the mast it is only necessary to walk between the mast and pegs fixed into the ground and not between two pegs at a distance from the mast. This minimizes the amount of walking which is necessary in erecting the mast. Clamps between sections are formed from a strap around the outer of two concentric sections. The ends of the strap are secured together and attached to a member with a pressure face. A camming device between this member and the mast which acts against the pressure face and the mast enables the strap to be tightened thus gripping the outer mast portion against the inner mast portion. The top section of a telescopic mast is less inherent rigidity than the bottom section and this it is preferable to construct it from material with a greater resistance to longitudinal bending than the lower section and to vary the resistance of the intermediate sections accordingly.

Abstract: An engine comprising; a substantially cylindrical housing; a rotor rotatably mounted in said housing on an axis parallel with the longitudinal central axis of the housing to execute an orbital motion within the housing, a plurality of tubular elements each slidably mounted over fixed piston elements projecting substantially inwardly from the housing; said tubular elements being closed at their inner ends and having their inner ends in slidable driving engagement with said rotor for causing reciprocation of the tubular elements over the piston elements upon rotation of the rotor; and the volume of the space defined by the interior of the tubular element and the piston element varying with the rotation of the rotor.