C 10/i ) 
IV. Jn account of fome Experiments jnade on the 
27th day of April, i7ip. to find how much the 
^efifiance of the Air retards falling Eodies, By 
J. T. Defaguliers, LLt D. O' F. R. S. 
I Took iz Balls ('fix of which were folid Leaden 
Globes of about z Inches Diameter ; three hollow 
Glals Balls of about 5 Inches Diameter; and three 
light Paftboard hollow Globes of abou: the fame Dia- 
meter) and having carried them to the upper Gallery in 
the Lanthorn, on the Dome of St. Paul's Church, I 
caufed them to fall down by two at a time, in the 
following manner; 
Firfi, a Leaden Ball and a Glafs Ball. 
Secondly, a Leaden Ball and a Glafs Ball. 
Thirdly, a Leaden Ball and a Glafs Bali. 
Then I let fall in the fame manner the three other 
Leaden Balls, each with a Paflboard Ball. 
After that, having the Leaden and Paftboard Balls 
brought up again, i repeated the Experiment twice 
more with a Leaden and Paftboard Ball ; then I made 
the Experiment twice more with a Paftboard Bali 
alone, to fee how long it would be in falling. 
Upon the whole it appeared that the Leaden Balls 
were a very little longer than 4 ~ Seconds in falling ; 
the two largeft of the Glafs Balls 6 Seconds, and the 
Paftboard Balls 6 7 Seconds. 
The height of the Gallery, from whence the Bodies 
fell, was zjz Foot above the Pavement of the Church 
(then cover’d with Boards) upon which they fell. 
The times of the Falls were taken two ways above, 
viz* with a Wheel- Chronometer, which meafures a 
to C fmali 
