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Lot Essay
COMPARATIVE LITERATURE
Charles K. Aked, Electrifying Time, catalogue of an exhibition held at the Science Museum, 15 December 1976 - 11 April 1977, A.H.S., Ticehurst, 1976
Alan & Rita Shenton, Collectable clocks, Woodbridge, 1987, chapter XIII, p. 397, figs. 415 & 6
Frank Holden took out his patent for this clock in 1909 and it was another attempt to devise a clock with a pendulum that was as 'free' as possible. The pendulum carried a high resistance coil which moves freely over two horseshoe-shaped magnets with soft iron poles to concentrate the magnetic field at the zero position of the pendulum. Two metal discs for the pendulum bob, the lower carrying a pivoted trailer, makes contact with an electric contact projecting from an insualting pillar mounted on the base of the clock. The main defect was the lightness of the electrical contact and the inconstancy of the contact resistance which is minimised by the use of a high resistance coil.
Charles K. Aked, Electrifying Time, catalogue of an exhibition held at the Science Museum, 15 December 1976 - 11 April 1977, A.H.S., Ticehurst, 1976
Alan & Rita Shenton, Collectable clocks, Woodbridge, 1987, chapter XIII, p. 397, figs. 415 & 6
Frank Holden took out his patent for this clock in 1909 and it was another attempt to devise a clock with a pendulum that was as 'free' as possible. The pendulum carried a high resistance coil which moves freely over two horseshoe-shaped magnets with soft iron poles to concentrate the magnetic field at the zero position of the pendulum. Two metal discs for the pendulum bob, the lower carrying a pivoted trailer, makes contact with an electric contact projecting from an insualting pillar mounted on the base of the clock. The main defect was the lightness of the electrical contact and the inconstancy of the contact resistance which is minimised by the use of a high resistance coil.