( $43 ) 
refpecF to the equinoctial and folflitial Points of die 
Ecliptick. 
Thele Confiderations determined me ; and by the 
Contrivance and Direction of the fame ingenious 
Perlon, Mr. Graham , my Inflrument was fixed up- 
Augufl 19, 1717. As I had no convenient Place 
where I could make ufe of fo long a Telelcope as 
Mr. Molyneux’s, I contented my felf with one of 
but little more than half the Length of his {viz. of 
about 12- Feet, his being 241.) judging from the 
Experience which I had already had, that this Ra- 
dius would be long enough to adjufl the Inflrument 
to a fufficient Degree of Exa&nefs, and I have had 
no Reafon fince to change my Opinion : for from all 
the Trials I have yet made, I am very well fatisfied,. 
that when it is carefully re&ified, its Situation may 
be fecurely depended upon to half a Second. As the 
Place where my Inflrument was to be hung, in fome. 
Meafure determined its Radius, fo did it alfo the 
Length of the Arch, or Limb, on which, the Divifions 
were made to adjufl it : For the Arch could not con- 
veniently be extended farther, than to reach to about, 
61 ° on each Side my Zenith. This indeed was fuffi- 
cient, fince it gave me an Opportunity of making. 
Choice of feveral Stars, very different both in Mag- 
nitude and Situation; there being more than two. 
hundred inferred in the Britijh Catalogue, that may be 
obferved with it. I needed not to have extended the: 
Limb fo far, but that I was willing to take in Gapella ,. 
the only Star of the firfl Magnitude, that comes fa 
near my Zenith* 
My Inflrument being fixed, I immediately began, 
to obferve fuch Stars as I judged mofl proper to 
Q, q q q 2 give 
