The construction of maps and globes; In two parts. First, contains the various ways of projecting maps, Second, treats of making divers sorts of ... plates. To which is added, an appendix,

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1717 ...Projections, becaufe the Degrees of Latitude in the outward Meridians are larger than thofe in the middle Meridian, and consequently the fame Meafure won't ferve Places that lie under different Meridians, C H A P. I. To make the Hagnet'ual Globe, which way at well in its internal Faculties, fa external Model, the Globe of the Earth. Kind of Globe, is by fbme Geographers very fitly term'd a Terrella, or little Earth, as differ ing only in Dimenfions frofn the great Earth, or that we inhabit for it hath its other Properties of Attra« ftion and Verticity (here call'd Dire&ion) in common with it. This is the Curiofity of it, and this is as much as can be expected from a Sphere of fo fmall a Size as that of the LoadStone confines it to. On this Magnetical Sphere, as on other Globes, are defcrib'd the feveral Lineaments and Piftures, reprefenting the fuperficial Figure of the Earth, which how to perform, obferve the following Directions. "Chufe a Magnet of the beft arid largeft Thofe that come from Bengal in the Eaft Indies, and China, are freeft of Heterogeneal Mixtures, which are ordinarily the Caufe of the Inefficacy in Load-Stones. Let it be ground to an exquifite Roundnefs, and bor'd through the Poles, wherein two fmall Pieces of Iron Wire muft be fix'd for the Axis, on which the Terrella is to turn within the Brazen If you have a Mind, you may annex the feveral Appurtenances as belong to common Paper for which, fee Chapter III... (.11 ) g. The chief Difficulty is in finding the Poles, Parallels, and Meridians of the Magnet j all which may be perform'd by a magnetical Needle in the following Manner. Various Ways there are for finding the Poles of a Load-Stone firft, A thin Piece of Steel about an Inch long, and half an I...