WatchProSite|Market|Digest

Breguet

A curiosity of horology...

 
 By: Ratskunk : September 8th, 2024-14:45
A curious footnote on page 233 of Ebenezer Henderson's  Life of James Ferguson FRS (Edinburgh, London, Glasgow 1867) quips the Franklin clock (a curiosity of horology) is "rendered almost unfit for general use".




For the uber curious: The 1788 New Royal Cyclopædia, and Encyclopædia; or, complete, modern and universal dictionary of arts and sciences Vol. I

 
 By: Ratskunk : September 8th, 2024-17:15
The Franklin 3-wheel clock makes an appearance in the 1788 New Royal Cyclopædia, and Encyclopædia; or, complete, modern and universal dictionary of arts and sciences...Illustrated with...copper-plates...In three...volumes...By George Selby Howard...Assisted by many gentlemen...John Bettesworth...Henry Boswell...Felix Stonehouse, D.D. and others. 1788: Vol 1.

The section commences with the following...

The ingenious Dr. Franklin has contrived a clock to shew the hours, minutes, and seconds, with only three wheels and two pinions in the whole movement. "The dial-plate “ Plate 104, fig. 8.[sic]) has the hours engraven upon it in spiral spaces along two diameters of a circle containing four times 60 minutes. The index A goes round in four hours, and counts the minutes from any hour by which it  has passed to the next following hour. "The time, therefore, in the position of the index shewn in the figure is either 32.5 minutes past XII, III., or VIII; and so in every other quarter of the circle it points to the number of minutes after the hours which the index last left in its motion. The small hand B, in the arch at top, goes round once in a minute, and shews the seconds. The wheel-work of this clock may be seen in figure 2. A is the first or great wheel, containing an hundred and sixty teeth, and going round in four  hours with the index A in fig. I, let down by a hole on it's axis.

...it is left to the terminally bored to suffer through the rest of the section.

Note: I cannot remember where the picture came from but at some point Plate 104 was colorized (see enclosed).














login to reply