Abstract: The present invention relates to an impulse wrench for use in conjunction with a fastener engaging tool and a power supply to selectively rotate threaded fasteners. The wrench comprises a housing and an impulse manifold rotatably mounted within the housing. An impulse piston is mounted inside a impulse piston receiving space for reciprocating movement and has an impulse delivering surface and a pressurizing surface. The piston and the piston receiving space are constructed and arranged such that the pressurizing surface and an outer end portion of the piston receiving space cooperate to define at least a portion of a high pressure chamber which is filled with a substantially incompressible fluid.

Abstract: An optical system concentrates solar light energy or energy from another light or electromagnetic radiation source into a low-diverging, collimated, high-intensity beam. The optical system has several stages, each including an input collimating lens, a fresnel-like reflecting surface, and a parabolic reflector; and prior to the first stage is an input objective lens and at the output of the last stage is a pinhole aperture and an output collimating lens.

Abstract: An optical system concentrates solar light energy or energy from another light or electromagnetic radiation source into a low-diverging, collimated, high-intensity beam. The optical system includes an objective lens, an input collimating lens, a fresnel-like reflecting surface, a parabolic reflector, a pinhole aperture, and output collimating lens.

Abstract: A modulator screen drum assembly supports a multi-layer screen having the capability of selectively passing therethrough charged particles for aperture-controlled electrostatic printing. The drum assembly comprises a pair of rotatably supported end wall members axially positioned in spaced apart relationship. The modulator screen is secured to and wrapped around the end all members to provide a screen drum or cylinder. Adjusting means is provided for axially moving one of the end wall members relative to the other end wall member to stretch and tension the screen cylinder in a longitudinal direction, and locking means is provided for locking the adjusting means in the set position to thereby maintain the screen cylinder in properly tensioned and taut condition.