, ( Hi ) 
one whole Vibration, it came very little Ihort of the 
lame mark as it had come to in Water after fourteen 
Vibrations and when it vibrated twice in Mercury, 
* j am <f v-f r arae .P^ a ce it had done after between 26 
feveral time's “ 5 and this k did exadJ 7 
Afterwards filling an upright Copper Pipe of four 
Inches Diameter with Mercury to the height of 3 
foot 10 Inches, and fufpending the golden Ball in it 
71 ^ string about an Inch long, fo as to have 
the Ball juft immers d under the middle of the fur- 
face of the Mercury ; I caus’d it to be let down fud- 
. and obf «vmg how long it was falling down 
to the bottom of the Tube, I found that the Experi- 
« b y Ball ’ s Unking againftfoe 
fides of the Tube, which retarded the fall of the 
t R e „ m0re , fo ‘ he oftner the Ball ftruck. 
When the Ball was leaft retarded, it was only two 
Seconds and a half in falling, which muft be taken 
“S'.*™* Ume ° f , the fal1 of the Bal1 « ^ height 
of Qpickfilver equal to 3 Foot 10 Inches 1 becaufe 
when I try d the Experiment again at home the firft 
Day of April following, the Ball fell in the Mercurv 
once or twice without ftriking the fides of the Tube 
at all but not in lefs time than 2 -f Seconds. 
D he 5 t! r er Ex P erim ents at home, ma- 
king the Golden Pendulum 39,2 Inches long, fo as to 
make it vibrate but once in a Second, and then I found 
l hat ‘F w .°. u d v fbrate 5 or 6 times in the Mercury be- 
fore the Vibrations became fo fmall as not to be ob- 
ferydi and then the firft Vibration in the Mercury 
ended very near where the 14th in Water had done • 
the fecond in Mercury ended where the 27th in 
Water had done, and obferving the third Vibration 
m 
