Sinclair Harding Clock

This Clock is based on the Harrison No1 Navigation Clock of 1720.  It was designed by John Harrison as result of the establishment of a Board of Longitude by the British Government is 1718 with prize money of 20,000 pounds for the first clock that could be taken on board a ship for use at sea with sufficient accuracy to calculate longitude (which is a function of time).  It was Harrison's genius which replaced the pendulum with interlinked balance arms on roller bearings, with temperature compensation and maintaining power to keep the clock going while being re-wound.

The Meccano clock faithfully reproduces the hypnotic action of the twin linked balance arms and the fascinating grasshopper escapement which are features of Harrison's clock.

The clock was first seen at the North Midlands Meccano Guild exhibition at Skegness in 1988, where it won the Issigonis Shield.  The clock has now been re-designed with improved grasshopper action, roller bearings, and maintaining power using an endless chain and weight based on the Huygens principle.  The weight is rewound once every fifteen mintes by an electric motor tripped by a limit switch.

The clock is housed in a Meccano case built from angle girders in a box construct, and is improved with glass panels and a wooden plinth.

Michael Adler - February 2002

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