Geodaesia: Or, The Art of Surveying and Measuring Land Made Easy. Shewing by Plain and Practical Rules, to Survey, Protract, Cast Up, Reduce Or Divide Any Piece of Land Whatsoever; with New Tables for the Ease of the Surveyor in Reducing the Measure of Land. Moreover a More Facile and Sure Way of Surveying by the Chain, Than Has Hitherto Been Taught. As Also to Lay Out New Lands in America, Or Elsewhere: and how to Make a Perfect Map of a River's Mouth Or Harbour; with Several Other Things Never Before Published in Our Language
G.G.J. and J. Robinson, 1792 - 206 pages
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15 chains 20 links 5o links acres alſo Anſwer baſe becauſe beſt C H A caſt cauſe circle circumferentor Co-fine Co-tang compaſſes croſs degr degrees deſcribe the arch deſired diameter divide diviſion draw the line E X A M P L eaſting equal eſpy faſt feet fide field field-book firſt ſtation fixed fights given Gunter's chain hedge hypothenuſe inſtrument interſe&tion juſt Laſtly length leſs line AC line of chords logarithm mark meaſure the diſtance multiply muſt needle obſervations off-ſets P R O parallelogram perches perpendicular pleaſure produćt protractor quotient reſt rhombus right againſt right angle roods ſame ſay ſcale ſecond ſee ſemicircle ſetting one foot ſeveral ſhall ſhew ſide Sine ſome ſouth ſquare ſtand ſtick ſtrait line ſubtract ſuch ſum ſuppoſe ſure ſurvey take the plot Tangent thereof theſe thoſe trapezium triangle uſe weſting whoſe
Page 62 - If you fdrvey by Mr. Norwood's Way, then there muft be four Columns more for EWN and Southing. You may alfo make two Columns more, if you pleafe, for Off-fets, to the right and left. Laftly, You may chufe whether you will have any Lines or not, if you can write ftrait, and in good Order, the Figures directly one under another. For this I leave you chiefly to your own Fancy ; for I believe there are not two Surveyors in England, that have exactly the fame Method for their Field Notes. Of the Scale....
Page 129 - ... the other is eafily found ; for as 7 is to 22, fo is the diameter to the circumference ; and as 22 is to 7, fo is the circumference to the diameter* In this annexed figure, the diameter AB is 2 chains or 200 links; which multiplied by 22 and the product divided by 7* gives 6 chains, 28 links, and fomething more for the circumference.