[ 75 ] 
“ creafe more and more as you go from the equinoc- 
£c tial toward either of the poles, which Martin Cor- 
££ tefe alfo noteth in his third book and fecond chap- 
<c ter of the art of navigation; But he omitted that 
£C wherein all the difficulty lyeth ; that is, how much, 
“ or in what propcrtion thofe fpaces ffiould increafe : 
£t Which that it may the better be perceived, I think 
“ it not unmeet firlt to ffiew by what kind of pro- 
££ jeCtion (or extenfion rather) the nautical planifphere 
“ may not unfitly be conceived to be geometrically 
££ made, after this manner. 
Mr. Wright’s Method. 
“ Suppofe a fpherical fuperficies, with meridians, 
£C parallels, rhumbs, and the whole hydrographical 
£t defcription drawn thereupon, to be infcribed into 
££ a concave cylinder, their axes agreeing in one.” 
£C Let this fpherical fuperficies fwell like a bladder 
<c (whiles it is in blowing) equally always in every 
cc part thereof (that is, as much in longitude as in 
££ latitude) till it apply, and join itfelf (round about, 
££ and all along alfo towards either pole) unto th» 
££ concave fuperficies of the cylinder: each parallel upon 
£C this fpherical fuperficies, increafing fucceffively from 
£C the equinoctial towards either pole, until it come to 
££ be of equal diameter with the cylinder, and con- 
<£ fequently the meridians ffill widening themfelves, 
££ till they come to be fo far diftant every where each 
“ from the other, as they are at the equinoctial. Thus 
<£ it may moft eafily be underftood, how a fpherical 
<£ fuperficies may (by extenfion) be made a cylindri- 
“ cal, and confequently a plane parallelogram fuper- 
M 2 ficies ; 
