## Fergusson's Percentage trigonometry: or, Plane trigonometry reduced to simple arithmetic, with a short description of his percentage compass |

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80 feet adjacent angles angle A C angle B A angle C O angle required angular measurement base base-line calculations cent centage central angle chord circular scale circumference circumferentor compass-card contained cosecant cotangent course Coversine decimal degree angle difference of latitude direction distance divided divisions of arc dotted line East equal Equation Euclid Example XXI Fergusson's Percentage Unit Fergusson's Rule figures formed given the length grades hypotenuse inclined line known points Length of Arc lines and angles lubber's-line marked mathematical tables meridian miles natural percentage cosine natural sines navigators North oblique triangle percentage angle number percentage circle percentage compass percentage divisions Percentage Theodolite perpendicular plane trigonometry problems in plane quadrantal line radian right angled triangle secant secant line shown in Fig simple arithmetic surveyors tangent traverse trigono trigonometrical lines unit of angular versine vertex angle numbers yards