( 3 ?<* > 
EXPERIMENT VII. 
I now touch’d the Needle at both Ends with the 
fame Stone, with which it was touch’d in the fifth 
Experiment, after which it perform’d 
The firfl 25 Vibrations in 
The next 25 in 
/ n 
1 35 
1 34 
The 50 in 3 
That is, each Vibration in 
The Dip . 74 0 20' 
The Dip repeated with the ? ^ 
Needle taken off and replaced 
9 
3.73 
EXPERIMENT VMl. 
Upon fhifting the Needle, it perform’d 
The firft 25 Vibrations in 
The next 25 in 
/ u 
1 33 
1 34 
The 50 in 3 7 
The Dip ' 74 * *5' 
The Dip repeated 74 3 °~ 
A. 10 - 
N B. The Needle had the fame Side to the Eaft in the 
firft , third , fifth , W fie vent h Experiments • W 
/W that Side turn'd Weft ward in the fiecond fourth, 
fix thy and eighth-, and I began to count the Vibra- 
tions, when I obfiervd it to vibrate juft 10 "De- 
grees , as near as I could guefis. All thefie Experi- 
ments were made with fufjicient Care in every Par- 
ticular, excepting the Quantity of the Dip, which 
requires the Divifions of the Semicircle to be very 
equal , 
