Ansonia Mantel Clock with Visible Escapement in Slate-Marble Case
You must be a subscriber, and be logged in to view price and dealer details.
Subscribe Now to view actual auction price for this item
When you subscribe, you have the option of setting the currency in which to display prices to $Au, $US, $NZ or Stg.
- Pendulum - The pendulum was discovered around 1602 by Galileo Galilei, and was adopted for time keeping by the Dutch mathematician and natural philosopher, Christiaan Huygens, who excelled in astronomy, physics, and horology.
The pendulum comprises a metal rod usually of brass or steel with a metal disk, known as a bob, at the end. The movement of the pendulum is driven by weights or a spring, and as a pendulum swings in a regular arc, it was found accuracy could be controlled to within a few seconds a week.
Timekeeping can be adjusted by changing the height of the bob on the rod, making the pendulum either swing slower or faster.
The disadvantage of the pendulum was that changes in temperature also changed the length of the pendulum, interfering with the accuracy of the clock, and so in the 18th century two types of mercurial pendulums were invented which countered the movement in the steel rod.
The pendulum was the world's most accurate timekeeping technology until the invention of the quartz clock, regulated by a quartz crystal, in 1927.
This item has been included into following indexes:
- Ansonia (United States) - clocks, maker or retailer 316
-
clocks, material or decoration
- marble or slate 425
- slate 344
Visually similar items
An 18ct white gold triple cluster ring; centring an approx. 5ct blue oval sapphire surround by 20 round brilliant cut diamonds adjacent to two clusters each with a step cut blue sapphire and 14 round brilliant cut diamonds. Size M. Wt. 7.6g.
A set of amethyst jewellery; ring features a 16 x 12 mm step cut amethyst, stud earrings each with a 10 x 8 mm step cut amethyst in 9ct gold. Size N. Wt. 8.6g
A 18ct. white gold and diamond Girard Perregaux lady's watch, 1960's vintage, square white face with silver hands and markers surrounded by 21 round brilliant cut diamonds, the 18ct. gold strap of knitted mesh 30.36gms.
A Georgian style sterling silver quart lidded tankard with scroll handle. William Watton & Sons, Sheffield 1908. Weight 767g.