Abstract: This invention is a device to test fastener heads and thread run-out areas for mechanical strength and detect defects. A fastener head is placed through a hole in a wedge-shaped washer and the shaft put under tension so that the fastener head completely contacts the wedge shaped washer. The stress produced is calculated to be within the elastic limit of the material and produces a stress in the shaft near the fastener head similar to that shown in FIG. 3. If the fastener is defective or is non-conformant to state-of-the-art standards, the fastener will fail when this test device is used. This method allows improved detection of hydrogen embrittened and improper heat treating processes which results in fasteners that will have unsatisfactory mechanical properties.

Abstract: An improvement in rail threading devices having at least four rollers mounted on two rectangular plates. Each rectangular plate is fastened by a stud to a framing member which allows movement of the rectangular plate relative to the framing member. The framing members are mechanically attached together so that the rollers will straddle a section of rail and grip the rail from the underside of the rails' upper section when the device is lifted by a crane. The mechanical attachment of the framing members is such that the device can be used to lift a rail which is on the ground and further allow the rollers to be separated when the tension on an attached crane cable is relaxed thereby providing for ease in removal or attachment of the device.

Abstract: A device allowing direct measurement of tibial torsion.This mechanical device utilizes two hinged members and an angle measuring means to directly ascertain the amount of torsion of the tibia in the coronal plane.

Abstract: In the field of grip enhancing devices a glove having the thickness of its material varying in proportion to the voids between the hand and an object being held produces the effect of a custom grip. This glove is useful in areas where a conforming handle would be beneficial.

Abstract: This invention relates to a device useful in photographic perspective control. More particularly the invention utilizes movable optical prisms to effect perspective control in fixed lens cameras similar to the effect of the convention "view camera".