Abstract: The sight is of the type in which a virtual image of a graticule pattern (3) is made to overlie the view of a target through the sight along a viewing axis of the sight. The sight has an optical arrangement with a single composite graticule pattern having a light transmissive component and a light reflective component. The composite graticule pattern may be illuminated by light from the sky above the target or by the light from an artificial source to give a virtual image of at least a part of the single graticule pattern. Thus an artificial light source may be permanently mounted to the sight, to allow a daylight reflective graticule to be used during daylight and a transmissive graticule to be used at night time. During the day superimposed images of both graticule patterns may be viewed.

Abstract: At least one brake shoe (14) comprising a lining support member (16) and two lining sections (20) fastened one behind the other in circumferential direction to the support member (16) is arranged in a brake drum (10) which has a circular cylindrical internal braking surface (12). Each lining section (20) has an at least approximately circular cylindrical friction surface (22) the radius of curvature (R22) of which is smaller than the radius of curvature (R12) of the braking surface (12) and the center of curvature (M22) of which is located such that only a center portion of the friction surface (22) engages the braking surface (12) upon actuation of the brake.

Abstract: Improved guard and blade assemblies for a rotary cutting machine; wherein the guard has a full rear skirt, and an apertured front skirt of three designs of guard element mounted in cantilever; and wherein the cutter blade is of the swivel type but with retention means for the cutter blade designed to warn the operator of swivel blade pivot failure and with the blade being replaceable without need to disassemble the cutter head; the cutter blade has apertures for adjustable weighting of the swivel blade to provide a variable moment arm; an improved design of replaceable blade tip is also proposed for propeller-type and swivel-type blades.