( p8 ) 
» 
ingthatin the open Air the Wind gave iome Diftur- 
bance, I put up another Line, after the fame manner, 
in a Room two pair of Stairs high ; this Line was a- 
bout the lame length with the other, and thirty-nine 
Inches above the Floor. Some time after I put up a 
third Line, of the fame Length, in the Room over 
this. By the Method madeule of in fixing thele Lines 
, they could .not differ above i' of a Degree from the 
Meridian, or from one another. Before I had made 
any Trials, I imagined no other Difference would a- 
riie than what might be occafioned by the FriCHon of 
the Needle upon the Point it was to move upon, and 
having found that confiderable in all the Needles that I 
had taken notice of, I took more than ordinary Care to 
provide againft it, and fucceedcd beyond my Expecta- 
tion. For I havefeveral times obferved all the three 
Needles return fo exactly to the fame Place, that I 
could not perceive the leaf! Difference ; as likevvife all 
three to agree very nearly about the fame Time, when 
they have been placed in the lame Box immediately 
one af er another, the Box remaining unmoved. The 
firft Needle I made, was a little above three tenths of 
an Inch broad, about ,c6 in thicknefs, and weighed a- 
bout an Ounce Troy, the Cap of Chryftal. After 
lome Trials with this Needle, it was made narrower, 
not to exceed half a tenth of an Inch, and it then 
weighed five Peny Weight and five Grains. The le- 
cond Needle was at firll: about three tenths of an Inch 
broad, and ,04 thick, the Cap of Glafs ; and after fe- 
veral Trials, it was made lo much narrower, that its 
Breadth was a little lels than itsThicknels,and it weigh- 
ed two Peny Weight and five Grains. The third 
was nearly of the fame Dimenfions with the lecond, 
and weighed two Peny Weight and three Grains. 
When 
