Позолоченная античная бронза имитация из Америки 30 секунд прямоугольный конгрив-Роллинг шарового механические настольные часы

Описание и отзывы

Трекер стоимости

Характеристики

  Cast Copper 30 seconds Rectangular Congreve's Rolling Ball    Antique Table Clock with Wooden Base & Glass Cover

 

 

Specification

 

Code	Decspriton	size/mm	N.W/kg	Carton Size/mm	G.W/kg	Pcs/Carton
JG9002	copper 30 seconds Congreve's Rolling Ball Clock	420×400×550	19	460×445×545	22	1

 

Dome Glass:	No chips and cracked	Tape:	Table Clock
Case Condition:	Very Good	Dial Numerals:	Roman & Abrabic
Setting Type:	Lever	Dials Condition:	Excellent
Weight:	19kg	Movement Running:	Yes
Dimension:	Length 420mm Width 400mm Height 550mm	Instruction Book:	Yes

 

 

 

Intrudtion of Congeve's Rolling Ball Clock

 

 

    A Congreve clock (also known as Congreve's Rolling Ball Clock or Oscillating Path Rolling Ball Clock) is a type ofclock that uses a ball rolling along a zig-zag track rather than a pendulum to regulate the time. It was invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zig-zag track, where it trips theescapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward. Thus the angle of the plate reverses and the clock hands move forward between one and four times every minute. On versions of the clock with a dial to indicate seconds, the second hand jumps forward either 15 or 30 seconds on each oscillation depending on the length of the track.

    Congreve appears to have been unaware that rolling ball clocks had been invented earlier by both Nicolas Grollier de Servièreand Johann Sayller. Congreve's version differed from Grollier's rolling ball clock in that the ball travelled down a zig-zag rather than straight path. While Sayller's version had also used a zig-zag path, it had utilized a number of balls and a fixed table rather than the single ball and tilting table employed by Congreve. The "Extreme Detached Escapement" (as Congreve referred to his escapement design) was patented in 1808. Congreve, who was not a clock maker, hired Gravel and Tolkien to produce the first working version, which he then presented to thePrince of Wales in 1808. This version was weight-driven, but the second design, which appears to have been constructed by John Moxon, was spring-driven. The second model is in the collection of Buckingham Palace.

Congreve clocks are unreliable timekeepers — the time taken for the ball to travel along the track varies greatly depending on the cleanliness of the track and ball, and since the plate is aligned horizontally it is easy for dust to accumulate.

 

Picture  Gallary