• t7 2 h 
About the year 1720, a curvilinear fea chart made 
ks appearance, faid to be done by Henry Wilfon, 
the publishers whereof reprefented Wright’s chart 
as puzzling, difficult, and fade. 
But thele groundlefs affertions were rationally an- 
fwered by Mr. Thomas Hafelden, afterwards mailer 
of the Royal Academy at Portfmouth, in a letter 
and pamphlet addreffed to Dr. Halley about the year 
1722. 
In the year 1755 was published a book intitled, 
<c The art of failing upon the Sea”, by W. E. which 
initial letters are lufficient to point out the inge- 
nious author. — In page 74 he laies, “ It is demon- 
<c ftrable (by the method of fluxions) that the length 
££ of the part of the meridian line in Mercator’s 
££ chart, which reprefents the difference of latitude 
££ of two places upon the globe, is equal to the dif- 
tc ference of the log. tangents of half the compli- 
££ ments of the two latitudes, multiplied into the 
“ number 2,30258509, and that product into the 
££ radius of the Sphere”. 
And in Scholium to his Fundamental principles, 
page 75. “ In the few foregoing proportions, I 
<£ have demonstrated the truth of the chief methods 
££ of failing nowin ufe; and deduced them from their 
<c genuine principles, and fixt them upon their pro- 
<£ per foundations : By which the reader will be en- 
<{ abled to fee that this theory is not founded upon 
<£ falfe principles ; but upon fuch as are folid and 
* £ true; and consequently that all calculations built 
££ hereon may be depended on as exadt”. 
Notwithstanding thefe, Wright’s method is charged 
with great imperfection by the late Mr. WeSt of 
Exeter, in his pofthumous work, referred unto by 
2 Mr. 
