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Seller: Top-Rated Seller jewellery-trade-resources (72.886) 99.4%, Location: LONDON, Ships to: Worldwide, Item: 250689335262 NEW REPLACEMENT CLOCK SUSPENSION SPRINGS FOR 400 DAY CLOCKS .0040" ( 0.102mm ) thick 135mm long Pack of 3 springs Horolovar suspension springs are made of an outstanding alloy known as Ni-Span C. With this alloy, spring stiffness is automatically controlled for any change in temperature.In addition, the control in the Horolovar spring has been set to compensate for expansion or contraction of the pendulum bob. As a result, when a 400-day clock is fitted with a Horolovar suspension spring, temperature change will not change the rate of the pendulum cycle. Changes in room temperature seriously affect the rate of the pendulum cycle if the clock is fitted with a bronze or steel suspension spring and not a Horolovar spring. If fitted with a steel or bronze spring when the temperature increases three things happen: 1. The suspension spring expands in all dimensions. 2. The pendulum bob expands. 3. The suspension spring loses part of its stiffness. The result is that the clock slows down. When the temperature decreases, the effect is reversed, and the clock speeds up. Other sizes are also listed in our shop. Condition: New, Type: Clock Parts, Sub-Type: Clock Suspension, Clock Type: 400 Day Clock, Featured Refinements: Clock Suspension

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