Kelvin, William Thomson, Baron, 1824-1907, Darwin, George Howard, Sir, 1845-1912, Tait, Peter Guthrie, 1831-1901 · Cambridge [Eng.] : University Press · leaf 488
agram.The reading is effected by a sliding-piece whose edge is perpendicular tothe length of the scale. Supposethat it is PQ whose position on thescale is required. This can evidently cut only one of the transverse lines. Its number gives the numberof tenths of an inch [4 in the figure], and the… … 466 PRELIMINARY. [419 Diagonalscale. Yernier. method, we may mention that a quadrant of 3 feet radiuswhich belonged to Napier of Merchiston, and is divided onthe limb by this method, reads to minutes of a degree; nohigher accuracy than is now attainable by the pocket sextantsmade by Troughton and…
Calculators · Mechanics, Analytic · Tides
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
