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12 Chains 20 Chains 50 Links ABCD Angle ACB Angle CAB Base 26 Centre Chains and Links Circle Circumferentor Co-sine Co-tang Compasses the length contained Cyphers Degrees describe the Arch divide draw a Line draw Lines draw the Line Ellipsis equal EW N.S. Example fame Feet Field-Book fixed Sights given Line Gunter's Chain half Hedge Heptagon Hypothenuse Intersection Lastly Line A B Line AC Line of Chords Line parallel Logarithm measure the Distance multiplied N.S. EW N.S. O EW Needle Nonagon North-end Off-set outward Angle P R O Parallelogram Pentagon Perpendicular Piece of Land Protractor Quotient Radius Rhombus Right-angled Triangle Root Scale Secondly Semicircle setting one Foot shew Sights you espy square Links Stick strait Line subtract Survey Table take the Angle take the Plot Tangent taught Trapezia turn the Index Yards
Page 60 - Field. There are but two material things (towards the meafuring of a Piece of Land) to be 'done in the Field:, the one is to meafure the Lines (which I 'have fhewed you how to .do by the Chain) and the other to take the quantity of an Angle included by thefe Lines :, for which there are almoft as many Inftruments as there are Surveyors. Such among the reft as have got the greateft Efteem in the World, are the plain Table for fmall Inclofures, the Semicircle for champaign Grounds, the Circumferentor,...
Page 58 - Injlruments for the taking of an Angle in the Field. There are but two material things (towards the meafuring of a Piece of Land) to be 'done in the Field:, -the one is to meafure the Lines (which I -have fhewed you how to .do by the Chain) and the other to take the quantity of an Angle included by thefe Lines:, for which there are almoft as many Inftruments as there are Surveyors. Such among the reft as have got the...
Page 13 - F, -dv. except fuch as are made by dividing the Circumference of a Circle into any Number of equal Parts :, for then they are regular Figures, having all their Sides and Angles equal:, and are called according to the Number of right Lines the Circle is divided into, or more' properly according to the Number of Angles they contain, as a Pentagon, Hexagon, Heptagon, Octogon, <&c.
Page 162 - All Circles are in proportion ,to one another as the Squares of their Diameters ; therefore, if you divide the Square of the Diameter or Semidiameter, and extract the Root, you wit!
Page 141 - But if it be large, as the Map of a County, or the like, the only way is to compafs in the Plot firft with one great Square :, and afterwards to divide that into as many little Squares as you fhall fee convenient. Alfo make the...
Page 135 - Polygon. In the following Pentagon the Side BC is 84 Links, the whole Sum of the five Sides therefore muft be 420, the half of which is 210:, which multiplied by the Perpendicular AD 56 Links gives 11760 fquare Links for the Content, or 1 8 Perches A of a Perch, almoft 19 Perches.