i 441 ) 
IIT. Account of Mr. Thomas Godfrey V hr* 
pro^ement of DavisT Quadrant, transferred 
to the MarinerVBow, communicated to the 
Royal Society, by Mr. J. Logan. 
B Eing inform’d that this Improvement, pro'pofed by 
Thomas Godfrey of this Place, for obferving the 
Sun’s Altitude at Sea, with more Eafe and Expedi* 
tion than is practicable by the common Inflruments' 
in ufe for that purpofe, was laft Winter laid be- 
fore the Royal Society , in his own Defcription of it $ 
and that fome Gentlemen wifh’d to fee the Benefit 
intended by it more fully and clearly explained: 1, 
who have here the Opportunity of knowing the Au- 
thor’s Thoughts on fuch SubjeCls, being perfwaded in 
my Judgment that if the Inftrument, as he propofes 
it, be brought into Practice, it will in many Cafes be 
of great fervice to Navigation, have therefore thought 
it proper to draw up a more full Account of it, than 
the Author himfelf has given, with the Advantages 
attending it ; which if approved of by better Judg-* 
ments, to whom what I offer is entirely fubmitted* 
*tis hoped the Ufe of it will be recommended and 
further encouraged^ as alfo the Author. The Rife of 
the Improvement with its Convcniencies, as alfo a 
Defcription of it, are as follows-. 
Tko. Godfrey 5 having under the greateft Difad* 
vantages (as 1 obferved in my firfl Letter to Dr. i/^A 
ley? giving an Account of his Invention of the Re- 
flecting Inftmment) made himfelf Mailer of the 
Principles of Aftronomy and Optics, as well as other 
Nna Parts 
