Abstract: A brush assembly for use with rotating slip rings wherein a plurality of brush modules composed of flat separate elements with brushes therein are assembled in a stacking order with spacers selectively placed between modules to facilitate the positioning of the brushes opposite the slip rings. Each module is molded separately to provide ease of molding, assembling and maintenance.

Abstract: An analog-to-digital converter or encoder utilizes a combination of a standard photoelectric encoder and improved slow-friction long-lasting brush-type encoder which together with the necessary code conversion circuitry will produce an absolute unambiguous decimal digital readout and a visual display of the readout all contained in a single compact housing which can be mounted in direct association to the object being measured. The encoder circuit also has an internal clutch arrangement whereby the encoder systems can be selectively disconnected from the input to allow the encoder to remain at zero or some other reference point while the relative positions of the encoder and the object whose position is being measured are changed.