.. [ 77 ] . . .. 
lines drawn from the center thro’ all the points in the 
fpheric furface, and terminating in the concave fur- 
face of the tube, are fecants, and the tube becomes a 
tangent line to all tnofe refpeCtive fecants: And, does 
not Wright’s uniform dilatation, by the fecond law of 
motion, produce the fame? 
Weft flops here, and gives us a chart at once ; Wright 
calls thefehis geometrical lineaments only, by which 
he obtains a rectilinear planifphere, and from whence 
he demonftrates the principles upon which his table of 
meridional parts are founded. 
And that he does not efteem this as a chart corn- 
pleated, but only his apparatus, and preparative work, 
which requires yet to be applied and moulded into a 
true nautical chart, is evident from the next paragraph, 
sc Now then (faies he) let us diligently confider of the 
<c geometrical lineaments, that is, the meridians, rhumbs, 
tc and parallels of this imaginary nautical planifphere, 
<c that we may in like manner exprefs the fame in 
“ the mariner’s chart: For fo undoubtedly we (hall 
“ have therein a true hydrographical defcription of 
<c all places in their longitudes, latitudes, and directions, 
“ or refpeCtive fituations each from other according 
<{ to the points of the compafs in all things corref- 
“ pondent to the globe, without either fenfible, or 
“ explicable error”. 
And hence he proceeds to the proof and applica- 
tion of thefe his lineaments, to the conftruCtion of 
his table of latitudes, as he calls it ; which is, in 
this edition, computed to minutes of parallel-dif- 
".ance, but with a little contrivance in the calculus to 
educe the fame yet fomewhat nearer the truth. 
Notwithftanding this care and nicety in computa- 
lon, he is duly fenfible that his increments of latitude 
calculated 
