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“ ficies; becaufe the fupeFficies of a cylinder is no- 
“ thing elle but a plain parallelogram wound about 
“ two equal equidiftant circles that have one com- 
<c mon axtree perpendicular upon the centers of them 
<{ both’' &c — “ So as the nautical planifphere may 
* c be defined to be nothing elfe but a parallelogram 
“ made of the fpherical fuperficies of an hydrogra- 
<c phical globe infcribed into a concave cylinder, both 
“ their axes concurring in one; and the lpherical fu- 
<c perficies fwelling in every part equally in longitude 
“ and latitude, till every one of the parallels there- 
<c upon be infcribed into the cylinder (each parallel 
<c growing as great as the equinoctial) or till the 
“ whole fpherical fuperficies touch and apply itfelf 
“ every where to the concavity of the cylinder”. — 
“ In this nautical planifphere thus conceived to be 
C{ made, all places muft needs be fituate in the fame 
“ longitudes, latitudes, and directions or courfes, and 
tc upon the fame meridians, parallels, and rhumbs, that 
“ they were in the globe; becaufe, that at every point 
“ between the equinoctial and the pole, we under- 
“ ftand the fpherical fuperficies whereof this plani- 
“ fphere is conceived to be made, to fwell equally as 
“ much in longitude as in latitude (till it join itfelf 
<c unto the concavity of the cylinder) fo as hereby no 
<f part thereof is any way diflorted or difplaced out 
<c of his true and natural fituation upon his meridian, 
“ parallel or rhumb, but only dilated and enlarged : 
« c the meridians alfo, parallels and rhumbs dilating 
K and enlarging themfelves likewife, at every point 
* of latitude in the fame proportion”. 
By comparing thefe two modes of conftruCtion to- 
gether I think it is not very difficult to difcover that Mr. 
Weft’s derives its original from Wright’s; for right 
lines 
