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John Harrison
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John Harrison was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea.
Thomas King's 1767 portrait of John Harrison, located at the Science and Society Picture Library, London
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7).
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7).
Harrison's first sea clock, the H1
Harrison's first sea clock, the H1
Harrison's second sea clock, the H2
Harrison's second sea clock, the H2
Lignum vitae
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Lignum vitae is a wood, also called guayacan or guaiacum, and in parts of Europe known as Pockholz or pokhout, from trees of the genus Guaiacum. The trees are indigenous to the Caribbean and the northern coast of South America and have been an important export crop to Europe since the beginning of the 16th century. The wood was once very important for applications requiring a material with its extraordinary combination of strength, toughness, and density. It is also the national tree of the Bahamas, and the Jamaican national flower.
Mallet of lignum vitae, all sapwood
Wood of Bulnesia sarmientoi
Wood of Bulnesia sarmientoi
Pete Seeger with his extra-long, lignum vitae banjo neck
Pete Seeger with his extra-long, lignum vitae banjo neck
A hand plane with a lignum vitae sole, likely not actual Guaiacum but Bulnesia, and a pearwood body
A hand plane with a lignum vitae sole, likely not actual Guaiacum but Bulnesia, and a pearwood body