English Braemar Postal Agency Wall Clock
click the photo to enlarge
Antique English wood framed wall clock wood framed, hand written inscription verso indicates origin as Braemar Postal Agency. Untested, and key and pendulum unavailable. (Diameter 29 cm approx).
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.
This item has been sold, and the description, image and price are for reference purposes only.
- Verso - Verso is the "back" side of a sheet of paper, art work, coin or medal. The front side is "recto".
- 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:
Visually similar items
19th century fusee railway clock, key and pendulum included, 46 cm diameter
Sold by
in
for
You can display prices in $Au, $US, $NZ or Stg.
19 century fusee railway clock, with pendulum, wooden case, 39 cm diameter
Sold by
in
for
You can display prices in $Au, $US, $NZ or Stg.
19th century J.W.Winton fusee railway clock, no key or pendulum, diameter 38 cm
Sold by
in
for
You can display prices in $Au, $US, $NZ or Stg.
A c.1900 American mahogany framed circular school-type wall clock, the white dial with black Roman numerals, brass framed glazed bezel. with key and pendulum. Diameter 37 cm.
Sold by
in
for
You can display prices in $Au, $US, $NZ or Stg.