Abstract: An automobile height gauge for measuring the vertical distance between the floor or ground and certain parts of an automobile such as the bumper. A telescopic bar is provided with "U" shaped fittings at each end. These fittings are adapted to fit over the flanges of an automobile lift rack. A cartridge housing a measuring tape is slidably mounted on the telescopic bar. An exposed end of the tape is connected to a permanent magnet. The magnet is adapted to engage magnetically the automobile part whose height is to be measured. The tape is calibrated so that it directly reads the distance from the floor to the end of the magnet and hence the height of the automobile part being measured.

Abstract: An adjustment assembly for independently or simultaneously changing the caster and camber angles of the front wheels of a vehicle having a single axis suspension device, such as the MacPherson Strut, between the lower control arm and the upper control bracket that uses circular plates that may be fixed to the upper control bracket in any of four 90 degree angularly related positions with an eccentric aperture for laterally supporting the strut in numerous angular positions to vary the wheel spindle's caster and camber angles independently or simultaneously as desired.

Abstract: An atom demonstrator, particularly for the electrons, including a globe having spaced light bulbs on its surface. When the globe is rotated about two perpendicular axes simultaneously by a double gimbal or double yoke construction in a dimly lit room, the glowing bulbs scribe vivid curvilinear paths representing electron motion.

Abstract: A wheel base, tracking and frame analyzer that has a pair of gauges each having a set of telescoping channels is disclosed. The two channels of each gauge carry reverse scales which overlap when the channels are extended the tread width of a set of wheels under test. Contact fingers are carried by each channel so that a wheel and tire will be squarely engaged. An optical sight tube is adjustably located on each gauge so that a target reading may be taken on the reverse scales of the second gauge. Similarly, the second gauge adjustably supports a sight tube which reads the reverse scales on the first gauge. In a second embodiment, a semi-circle protractor is substituted for each sight tube, and an elastic cord is extended between the origin points of both protractors. The ratios of the two reverse scale target readings, when each sight tube or each protractor origin point is located on a unity ratio position on its supporting gauge, renders an indication of the wheel base, tracking, or frame distortion.