6o % Sir Robert barker’s Account of 
nine Targe fedtions; each of which again into ten, making 
ninety lefler divifions or degrees; and thofe alfo into 
twenty, exprefling three minutes each, of about two- 
tenths of an inch afunder; fo that it is probable, they 
had fome method of dividing even thefe into more mi- 
nute divifions at the time of obfervation. 
My time would only permit me to take down the par- 
ticular dimenfions of the moft capital inftrument, or the 
greater equinoctial Sun-dial, reprefented by figure a, 
plate 12 . which appears to be an inftrument to exprefs 
folar time by the fhadow of a gnomon upon two qua- 
drants, one fituated to the eaft, and the other to the weft 
of it; and indeed the chief part of their inftruments at this 
place appear to be conftrudted for the fame purpofe, ex- 
cept the quadrants, and a brais inftrument that will be 
defcribed hereafter. 
Figure b is another inftrument for the purpofe of de- 
termining the exact hour of the day by the fhadow of a 
gnomon, which ftands perpendicular to and in the cen- 
ter of a flat circular ftone, fupported in an oblique fitua- 
tion by means of four upright ftones and a crofs-piece; 
fo that the fhadow of the gnomon, which is a perpendi- 
cular iron rod, is thrown upon the divifions of the circle 
defcribed on the face of the flat, circular ftone. 
5 Figure 
