Abstract: Control mechanism for a pneumatic hand tool which provides improved performance, speed regulation and control of the tool in air pressure ranges up to at least 116 pounds per square inch gauge (psig). A pneumatic hand tool embodying subject control mechanism includes a cylinder having an implement, such as a chisel, secured thereto and a reciprocating piston in the cylinder, the piston adapted to be driven by pressurized air into impact engagement with the front head of the cylinder, and returned to the rear cylinder end without impact. The control mechanism comprises an adjustable control valve which meters the volume of incoming pressurized air to that amount which produces desired tool operation, and an improved ball valve between the control valve and the cylinder. The control valve includes a radially movable spring-biased valve pin which cooperates with a valve seat, and a rotatable control ring in effective relation with the valve pin.

Abstract: An optical toe gauge for measuring the toe-in and toe-out of vehicle wheels includes a pair of support arms respectively mounted from the wheel hubs and carrying light beam projector assemblies at the forward ends thereof so that the direction of each beam is dependent upon the toe of the associated wheel. Each arm also carries therebelow a screen on which is projected the beam from the opposite projector, each screen being disposed at approximately a 45.degree. angle to the corresponding wheel axis and facing inwardly between the wheels, each screen having toe increment lines thereon with enlarged spacing therebetween to facilitate reading of the toe measurement on the screen.

Abstract: To concentrate a material by separating it from a diluting medium, the combination of the material and medium is placed in one of two wells in the bottom of a plastic sample concentrator cell, with each well being closed at its bottom end by a different cellophane membrane in contact with a buffer solution in a different one of two buffer compartments. A buffer solution also connects the combination of material and medium in one well and the cellophane bottom of the other well within the sample concentration cell through a recess in the bottom of the sample concentration cell. A potential is applied across the two buffer compartments to cause the material to migrate by electrophoresis from the medium in one well, through the buffer in the sample concentrating cell and into the other well, where it is concentrated against the cellophane membrane for easy removal by pipetting.

Abstract: To concentrate a material by separating it from a diluting medium, the combination of the material and medium is placed in one of two wells in the bottom of a plastic sample concentrator cell, with each well being closed at its bottom end by a different cellophane membrane in contact with a buffer solution in a different one of two buffer compartments. A buffer solution also connects the combination of material and medium in one well and the cellophane bottom of the other well within the sample concentration cell through a recess in the bottom of the sample concentration cell. A potential is applied across the two buffer compartments to cause the material to migrate by electrophoresis from the medium in one well, through the buffer in the sample concentrating cell and into the other well, where it is concentrated against the cellophane membrane for easy removal by pipetting.