(John, horologist, bap. 1693, d. 1776) The Proportion for finding the Miles corresponding to a Degree of Longitude in any Latitude..., manuscript in a secretary's hand, 1p., laid down, folds with tears repaired, slight traces of damp, pencil mark in right hand corner "1 1761", 195 x 302mm., [c. 1762]; and an autograph manuscript note by Humphrey Quill, v.s., n.d. [1950s or 60s] (2). *** Testing H4 on a trial to Jamaica. "The error of the watch in going to Jamaica was 5 seconds of time, which in the Latitude of that Island (viz 16º IV) is one mile and one fifth of a mile." - John Harrison
(John, horologist, bap. 1693, d. 1776) The Proportion for finding the Miles corresponding to a Degree of Longitude in any Latitude..., manuscript in a secretary's hand, 1p., laid down, folds with tears repaired, slight traces of damp, pencil mark in right hand corner "1 1761", 195 x 302mm., [c. 1762]; and an autograph manuscript note by Humphrey Quill, v.s., n.d. [1950s or 60s] (2). *** Testing H4 on a trial to Jamaica. "The error of the watch in going to Jamaica was 5 seconds of time, which in the Latitude of that Island (viz 16º IV) is one mile and one fifth of a mile." - John Harrison
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
