拍品 414
414
A French gilt-metal and black marble early rotary governor electric table clock
A French gilt-metal and black marble early rotary governor electric table clock

FOURTH QUARTER 19TH CENTURY

细节
A French gilt-metal and black marble early rotary governor electric table clock
fourth quarter 19th century
The concave moulded black marble base (lacking feet) supporting a gilt-brass square base with two columns supporting the movement with scooped plates and four-wheel train driven by an open pinion to the fourth (contrate) wheel by an unusual rotary governor electro magnetic pendulum, the white enamel Roman dial with blued steel moon hands and sweep centre seconds; later perspex rectangular dome
12¾ ins. 32.5 cm. high

拍品专文

This clock is an interesting use of the governor that we used to see on steam rollers many years ago. The idea is that as rotation of the pendulum inreases so does the speed, and the two governing weights ride outwards and are made to engage a contact which switches the current off and the slowing down breaks the contact and allows the motion to resume.
Although unsigned, the wheels and manufacture are of high quality; patents of this type of mechanism exist in the 1860's from Dutch inventors, but not of this precise clock.