John Harrisons tegning til det «mindre uret», som han nevnte for Board of Longitude 19. juni 1755, fra en samling mekaniske notater og tegninger utarbeidet av John Harrison (1693-1776) og hans sønn William (ca. 1726-72)(John Harrison's design for the 'lesser watch' mentioned by him to the Board of Longitude on 19th June 1755, from a set of mechanical notes and drawings compiled by John Harrison (1693-1776) and his son William (c.1726-72) (pen & ink on paper))Unbekannt |
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Udatert · pen and ink on paper
· Bilde ID: 978350
The Worshipful Company of Clockmakers' Collection, UK / Bridgeman Images |
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