Editing 1704 in science (section)

==Technology==
* The second [[Electric motor|electric machine]] is invented by British engineer [[Francis Hauksbee the elder]] ([[1660 in science|1660]]–[[1713 in science|1713]]): it is a sphere of glass rotated by a wheel.
* For watch movements, [[Peter Debaufre]] invents the Debaufre [[escapement]], the first frictional rest watch escapement produced: the escapement consists of two saw-tooth escape wheels of the same count.
* For watch bearings, a jewel bearing made of [[ruby]], comprising a ring (the "hole") with a sink for oil, is invented by Nicholas Facio with Peter and [[Jacob Debaufre]], who use pierced natural rubies. Other gemstones are used subsequently, including [[garnet]] (which is too soft) and [[diamond]]; in the 20th century, synthetic ruby or [[sapphire]] becomes universal for jewel bearings.
* In [[oil painting]], colormaker Diesbach of Berlin (Germany) accidentally invents the [[pigment]] [[Prussian blue]], a powerful dark blue pigment with greenish undertones (made from [[alum]] and animal bones); therefore, Prussian blue cannot be found in a paint layer predating this year.