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1707 (MDCCVII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1707th year of the Common Era (CE) and Anno Domini (AD) designations, the 707th year of the 2nd millennium, the 7th year of the 18th century, and the 8th year of the 1700s decade. As of the start of 1707, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
The 1700s decade ran from January 1, 1700, to December 31, 1709.
1704 (MDCCIV) was a leap year starting on Tuesday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1704th year of the Common Era (CE) and Anno Domini (AD) designations, the 704th year of the 2nd millennium, the 4th year of the 18th century, and the 5th year of the 1700s decade. As of the start of 1704, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
Abraham-Louis Breguet, born in Neuchâtel, then a Prussian principality, was a horologist who made many innovations in the course of a career in watchmaking industry, including the tourbillon. He was the founder of the Breguet company, which is now the luxury watch division of the Swiss Swatch Group.
The year 1779 in science and technology involved some significant events.
The year 1831 in science and technology involved some significant events, listed below.
The year 1841 in science and technology involved some significant events, listed below.
The year 1775 in science and technology involved some significant events.
The year 1776 in science and technology involved some significant events.
The year 1786 in science and technology involved some significant events.
The year 1780 in science and technology involved some significant events.
The year 1755 in science and technology involved some significant events.
The year 1748 in science and technology involved some significant events.
The year 1715 in science and technology involved some significant events.
The year 1657 in science and technology involved some significant events.
A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewels are typically made from the mineral corundum, usually either synthetic sapphire or synthetic ruby. Jewel bearings are used in precision instruments where low friction, long life, and dimensional accuracy are important. Their main use is in mechanical watches.
Events from the year 1704 in England.
A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves. A mechanical watch is driven by a mainspring which must be wound either periodically by hand or via a self-winding mechanism. Its force is transmitted through a series of gears to power the balance wheel, a weighted wheel which oscillates back and forth at a constant rate. A device called an escapement releases the watch's wheels to move forward a small amount with each swing of the balance wheel, moving the watch's hands forward at a constant rate. The escapement is what makes the 'ticking' sound which is heard in an operating mechanical watch. Mechanical watches evolved in Europe in the 17th century from spring powered clocks, which appeared in the 15th century.
Pierre Le Roy (1717–1785) was a French clockmaker. He was the inventor of the detent escapement, the temperature-compensated balance and the isochronous balance spring. His developments are considered as the foundation of the modern precision clock. Le Roy was born in Paris, eldest son of Julien Le Roy, a clockmaker to Louis XV who had worked with Henry Sully, in which place Pierre Le Roy succeeded his father. He had three brothers: Jean-Baptiste Le Roy (1720-1800), a physicist; Julien-David Le Roy (1724–1803), an architect; and Charles Le Roy (1726–1779), a physician and encyclopédiste.
References
- ↑ Carlisle, Rodney (2004). Scientific American Inventions and Discoveries. New Jersey: John Wiley & Sons, Inc. p. 189. ISBN 0-471-24410-4.
- ↑ Kaye, Brian H. (2008). Golf Balls, Boomerangs and Asteroids. New York: John Wiley & Sons. p. 145. ISBN 978-3-527-61482-0.