The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 23
beingplaced severally upon a ruler, form theinstrument called the Plane Scale (Fig.3), by which the lines and angles of alltriangles may be measured. All rightlines, as the sides of plane triangles, &c., when lliey are considered simply as such, without having any relationto a circle, are… … AWOISOISO 140 Plane Scale Fig. 3. Rhuiu. Clioi Sine S.T. 10 z±= 20 Z±ZL 30 40 80 =1= 10 20 30 60 70 9 0 I nil 30 -f— 60 Secants 10 4.0 =dcz 50 60 -t- 30 30 50 —I— 70 —I— 90 —t— 100 —I 110 -1— 120 I Djagonal Scale Fi£. 4.
Navigation · Nautical astronomy
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