238 GEODÆSlA Improved.

from E, and it will point you out the North Corner of BridgeMeadow, whereat you made a Beginning in this Main-line: Buihare remember that you’ll have no Occasion to take Notice (a Syou are planning) of those Perpendiculars which Were taken up

on the Left-hand Side of this Main-line, except the first you took

in Poplar Meadow, by which the Fence on the North Sidethereof, and also that between Poplar Meadow and Lawn-plud*,are drawn ; for all the other Fences or Hedges between and theformer Main-line, are already planned. Jt is likewise needlessto give any Directions (in this Place) to plan the Right-handPerpendiculars that are terminated by the River; for whoever i*ready in planning the foregoing Examples, cannot possibly be at aLoss to raise Perpendiculars from a base Line at each refpecti vePlace the same were taken at: However, in joining the Perpen'diculars with a Pencil, forget not to draw a Line parallel thereto,between 40 and 50 Links distant therefrom, to represent theRiver, which by the Chain, measured so much ; when done,turn over to the Dimensions of Cracadony, wherein you findthat the Main-line taken therein, begins at r, in the SouthCorner thereof, and passeth by k, the West Corner of the 0 s 'chard already planned, which limits the Direction of this Main*line.

Here note , All the Difficulty of planning from Main-lin £S *depends upon drawing them exactly true in their proper Place-This done, the Work will then be found to be exceeding easy-

Having drawn the Line, there will be no Occasion to takeNotice of the Perpendiculars on the Right-hand Side (except th sthree last) the Hedge being already planned which is on that Sidebetween this and the Quistil Field; therefore, by erecting, ° nthe Right-hand, (according to the Field Notes) Perpendicularrespectively, upon which the several Numbers, as they appear u’the Field Book, being laid thereon ; then, with the Pencil, j 01 *]the Ends of the fame, as heretofore directed. This last penciledLine shews the Hedge between Ash Field and Quistil,the Perpendiculars on the Left-hand Side, plan them as you y 1thofp on the Right-hand Side ois the last Main-line; this beingdone, and the Boundaries described by your Pencil, the wholesplanned save only the North West Side or Fence of Quistil k ie> »wherein the Proof and Truth of all your Proceedings ^