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Geodaesia improved; or, a new and correct method of surveying made exceeding easy in two parts : part I. Teacheth to measure, divide, and delineate, any quantity of land both accessible and inaccessible, whether meadows, pasture, fields, woods, water, commons, forests, manors, &c. by the chain only, whose dimensions are cast up by the pen, and consequently freed from the errors of estimation that unavoidably attend the scale and protractor. With necessary directions to map elegantly : part II. Introduces instruments, trigonometry, preparative remarks on the earth's superficies; and teacheth the invaluable method of casting up the dimensions of instruments by the pen several ways, all agreeing, &c. &c. : with a most useful appendix concerning the practical methods of measuring timber, hay'marl pits, bricklayers and plasterers work... / A. Burn
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GEODÆSIA Improved.

*99

Protraction.

First, Take up in your Dividers, the first Perpendicular, viz.16 Chains, 82 Links, from an inch, or any o her Scale, andlay it from A to B, according to the Directions given in the firstExample of this Chapter.

Secondly, at the Point B, erect the Perpendicular B C, andproceed herein as you were taught in Problem VII. of practicalGeometry (a Repetition thereof in this Place is needless) and theSquare will be complcated. See the Figure A B C D.

P RO B. II.

To plot a Field in Form os a Re£l-anglt, er long Square.Example.

Let it be required to plan the annexed Dimensions from a Scaleof is Chains, or 40 Poles to an Inch.

Brought from Page 107.

H.78-

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