( 45 ° ) 
any thing that might contribute to a publick Bene- 
fit, and to do fome juftice to Merit, could induce 
me, I fliall only requeft that what 1 have here 
offered may be conftrued by that Intention. 
PhUad. 28th of 
2me, 1734* 
J. Logah. 
Note, That the Radius of the Quadrant be- 
ing divided into 20 equal Parts, the Center X 
(in Fig- 1.) of the Curvature of the Horizon- 
Vane (AB) mud be 12 ,§ of thofe Parts from 
the Center ( C) of the Quadrant. The Breadth 
(A B oxg h) of that Vane ihould be 7^ of the 
whole Radius, that is, 75 on each Side of the 
Center (C). 
IV. Pefcription and life of an Injlrument 
for taking the Latitude of a Place at any time 
of the Pay 5 by Mr. Richard Graham, 
T H E needfity of finding the Latitude, a Ship 
is in, is too well known to be infilled on : Fre- 
quent opportunities of obferving the Latitude muff 
confequently 
