Geoda︠e︡sia, Or the Art of Surveying and Measuring of Land Made Easy ...

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J. Rivington, 1760 - Surveying

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Page 62 - 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 56 - 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 charnpain Grounds, the Circumferentor, the Theodilite, &c.
Page 158 - 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 51 - Acres by 10. And if you would turn fquare Chains into fquare Links, add four Cyphers to the End of the Chains, fo will 990 Chains be 9900000 Links, 1000 Chains be...
Page 129 - Circumference thereof; one of which being known, the 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.
Page 54 - Inftrument, and looking thro' the Sights: If you fee them between you and the Mark obferved, they are in a ftrait Line, othei wife not. But without all this trouble, they may carry the Chain true enough, if he that follows the Chain always caufes him that goeth before to be in a direct Line between himfelf, and the Place they are going to, fo as that the Foreman may always cover the Mark from him that goes behind. If they fwerve from the Line, they will make it longer ' than than really it is, a...

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