Horology

Rupert Thomas Gould (16 November 1890 – 5 October 1948) was a lieutenant-commander in the British Royal Navy noted for his contributions to horology (the science and study of timekeeping devices). He was also an author and radio personality.

Richard of Wallingford (1292–1336) was an English mathematician, astronomer, horologist, and cleric who made major contributions to astronomy and horology while serving as abbot of St Albans Abbey in Hertfordshire.

Robert Pickersgill Howgrave-Graham (sometimes Howgrave Graham) F.S.A., M.I.E.E. (9 July 1880 – 25 March 1959) was a British polymath. He trained as an electrical engineer and became a teacher, inventor and author but his lasting legacy, through his interest in archaeology, is his work as an antiquarian, historian and photographer. Often noted as a horologist, he became a specialist in medieval church clocks, and his research work on the clocks of both Wells and Salisbury Cathedrals is considered scholarship standard. Upon his retirement from teaching he pursued both his interest in photography and archaeology, becoming Assistant Keeper of the Muniments of Westminster Abbey.

Thomas Frederick Cooper (1789 – 9 March 1863) was a well-known Victorian English watchmaker in London who made high quality timepieces, particularly for the American market.

Victor Kullberg (1824–1890) was one of London's most famous watchmakers, described by one authority as "one of the most brilliant and successful horologists of the 19th century."

The quartz crisis (Swiss) or quartz revolution (America, Japan and other countries) was the upheaval in the watchmaking industry caused by the advent of quartz watches in the 1970s and early 1980s, that largely replaced mechanical watches around the world. It caused a significant decline of the Swiss watchmaking industry, which chose to remain focused on traditional mechanical watches, while the majority of the world's watch production shifted to Japanese companies such as Seiko, Citizen and Casio which embraced the new electronic technology.

Sidereal time ("sidereal" pronounced sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system, it is easy to locate the positions of celestial objects in the night sky. Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars".

In horology, a tourbillion or tourbillon ("whirlwind") is an addition to the mechanics of a watch escapement to increase accuracy. Conceived by the British watchmaker and inventor John Arnold, it was developed by his friend the Swiss-French watchmaker Abraham-Louis Breguet and patented by Breguet on 26 June 1801. In a tourbillon, the escapement and balance wheel are mounted in a rotating cage, with the goal of eliminating errors of poise in the balance giving a uniform weight.

A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial. As the Sun appears to move through the sky, the shadow aligns with different hour-lines, which are marked on the dial to indicate the time of day. The style is the time-telling edge of the gnomon, though a single point or nodus may be used. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, wire, or elaborately decorated metal casting. The style must be parallel to the axis of the Earth's rotation for the sundial to be accurate throughout the year. The style's angle from horizontal is equal to the sundial's geographical latitude.

Ahasuerus Fromanteel (circa 25 February 1607 – circa 31 January 1693) was a clockmaker, the first maker of pendulum clocks in Britain.