Strathearn Audio Limited

Colin Howard Stanwell-Smith

Dexter R Plummer

Keith Douglas Ridler

Alexander Bennett Gosling

Frederick James Easthope

Jonathan Humfrey Pope

Gerald Avison

John Alfred Aldous

A mechanical gearing with a first rotatable member, three spherical balls in contact with and rotated by the first member, a second relatively flexible member in contact with the balls and a third rigid member fixed with respect to the second member and against which the second member is urged by the balls so that the second and third members rotate with respect to each other.

Mechanical gearing

Method and apparatus for accurately controlling the position of a first member such as a phonograph stylus relative to a second movable member on which it is carried.

Control device

A tone arm for a record player having a mirror at one end is provided. Opposite the mirror are a light source and two detector elements. When the tone are pivots from a desired angle light from the source is reflected upon the element more than on the other. The mirror is convexly curved so that pivotal motions of the tone arm in one plane will not affect the amount of light reaching the detectors.

Method and apparatus for indicating angular displacement

A bearing arrangement for a spindle including a bush having tapered ends and members having internally tapered surfaces arranged to cooperate with the tapered ends, and means to clamp the members towards one another upon the bush to support a spindle passing through the bush.

Bearing arrangement

A combination of a turntable for playing phonograph records, a lid covering the turntable, tone arm for tracking record grooves, and a cleaning element mounted on the lid for movement into contact with a constant annular area on the top side of the record for cleaning. A counterbalance weight controls the pressure of the cleaning element upon the record.

Method and apparatus for use in cleaning a gramophone disc

The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.

Growing community of inventors

Cambridge, United Kingdom

Colin Howard Stanwell-Smith