15th-century inventions

device for evenly printing ink onto a print medium

thumb|A hemispherical-cup anemometer of the type invented in 1846 by Thomas Romney Robinson|John Thomas Romney Robinson

thumb|Japanese arquebuses on a rack at Himeji Castle

thumb|Rifling of a 105 mm Royal Ordnance L7 tank gun right|thumbnail|Conventional rifling of a 90 mm M75 cannon (production year 1891, [[Austria-Hungary)]] thumb|Rifling in a GAU-8 [[autocannon]]

type of hand drill

thumb|An uncoiled modern watch mainspring. thumb|Clock mainspring thumb|A pendulum clock|pendulum wall clock movement showing the two mainsprings which power it. This is a [[striking clock which sounds the hours on a chime; one of the springs powers the timekeeping gear train while the other powers the striking train]]

opening on the side of a ship's hull

Nautical navigational instrument

conical pulley-and-chain component in mechanical timepieces