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In 1752 Bartolomeo Ferracina started work on replacing the clock, having successfully tendered for the job in public competition. He installed a new movement, removed the planetary dials, installed a rotating moon ball to show the phase, and changed the numbering of the clock face from the old Italian style (I to XXIIII in Roman numerals) to the 12-hour style, using two sets of Arabic numerals ...
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has hours numbered 1–24 (or 0–23) around the outside, and the hour hand makes only one revolution per day.
Eardley Norton, a most highly esteemed member of the Clockmakers' Company, was working between 1762 and 1794. There are clocks by him in the Royal Collection and many museums worldwide. Norton made an astronomical clock for George III which still stands in Buckingham Palace.
The 24-hour analog dial continued to be used, but primarily by technicians, astronomers, scientists, and clockmakers. John Harrison, Thomas Tompion, and Mudge [7] built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments. 24-hour dials were also used on sidereal clocks.
A clock face with the Roman numerals typical for clocks, in Bad Salzdetfurth, Germany While subtractive notation for 4, 40, and 400 ( IV , XL , and CD ) has been the usual form since Roman times [ citation needed ] , additive notation to represent these numbers ( IIII , XXXX , and CCCC ) [ 9 ] very frequently continued to be used, including in ...
The two 12-hour cycles round the main face of the clock remained until about 1900 when the original 24-hour circle was discovered beneath them and they were removed. Further adjustments were made in 1953 and the latest, extensive series of repairs and alterations (some causing controversy amongst horologists) were carried out from 1998 to 2006 ...
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