( *77 ) 
Sun or Star is on the Meridian, the Quadrant will re- 
main fet ; and when the Sun or Star falls, the Bubble 
will ad: contrary to what it did in the riling, reft- 
ing wholly in the open End of the Tube. 
7 "o take the Sun's Altitude with the Horizon. 
Turn the Back of the Arch towards the Sun, and 
caufe the Sun’s Image to fall on the Hole in the Shield, 
at the fame time looking through the Eye-Vane, cut 
the Horizon with the Axis. 
N.B. In taking the Altitude of the Stars, a fmail 
Light mull be fixed in the Lanthorn } the lefs the bet- 
ter. It will be bell in forward Obfervations of the 
Sun, to take the Altitude of the upper Limb, allow- 
ing for the Semidiameter; and when the Sun is very 
clear, take his Altitude by a backward Obfervation, 
the forward Method being chiefly intended for Noctur- 
nal Obfervations, and when the Sun is too much ob- 
fcuredto give any Shade or Image. 
There was at the fame time laid before the Society , 
« An Extrad made by Mr. Elton of Obfervations of 
“ the Latitude from the Journal of Capt. Walter 
« Hoxton , Commander of the Ship Baltimore from 
“ the River of Thames to Maryland on the Conti- 
“ nent of America , by Davis's (or the common) 
“ Quadrant with the Horizon, and by Mr. Elton's 
“ (a new invented Quadrant) without the Horizon, 
“ Anno Dom, 1730.” 
From this Extrad it is obfervable, that in mode- 
rate Weather the Difference of the Obfervations, made 
O 0 by 
