GUNTER S scale, usually called by sea men the Gunter, is a large plain scale, having various lines upon it, of great use in working the cases or questions in na vigation. This scale is usually two feet long, and about an inch and a half broad, with various lines upon it, both natural and logarithmic, relating to trigonometry, navigation, &c. On the one side are the natural lines, and on the other the artifi cial or logarithmic ones. The former side is firstdivided into inches and tenths, and numbered from one to inches, running the whole length near one edge. One half the length of this side consists of two plain diagonal scales, for taking off dimensions to three places of figures. On the other half or foot of this side are contained various lines re lating to trigonometry, in the natural numbers, and marked thus, viz.
'tomb, the rumbs or points of the com pass; Chord, the line of chords; Sine, the line of sines ; Tang. the tangents ;
S. 1'. The semi. tangents ; and at the, other end of this half are, Leag. leagues, or equal parts; IZzimb, another line of rumbs ; M. L. miles of longitude ; Chor. another line of chords.
Also in the middle of this foot are L, and P, two other lines of equal parts : and all these lines on this side of the scale serve for drawing or laying down the figures to the cases in trigonometry and navigation. On the other side of the scale are the following artificial or lo garithmic lines, which serve for working or resolving those cases; viz.
S. R. the sine rumbs ; T. R. the tangent rumbs ; Numb. line of numbers ; Sine, sines ; V. S. the versed sines ; Tang. the tangents ; Merl. Meridional parts ; E. P. Equal parts.