( 10/6 ) 
-upper Coats of the Bladders, before 1 blowed them in 
the Box, to render rliem dill lighter. 
The Bladders I ufed were feme of the thinned I 
cou’d find ready blown at a Druggifls, which I moift- 
ned in Water, taking care to leave none in the infide. 
I chofe thole rather than Green ones, which in drying 
wou’d have duck fo fad to the infide of the Box, that 
it wou’d fcarce have been poflible to have got them out 
without tearing. 
Having prepared five Bladders in the manner afore- 
faid, (which 1 have deferibed the more fully to direct 
any body elfe that fhou’d be willing to try the like 
Experiments) 1 took them up to the upper Gallery in 
the Lantern on the Top of the Cupola in Sc. Pauls 
Church; and there by a Contrivance, which I (ball 
jud now deferibe, I let them fall by one at a time, 
together with a Leaden Ball of about x Inches Dia- 
meter, and weighing x /. Troj : and I took notice of the 
time of the Fall of each Bladder, knowing by former 
Experiments that the Balls are about 4 Seconds, or a 
little longer time, in faling the fame Height, which is 
^27x Feet. 
The following Table, confiding of five Columns, 
gives in the fird, the Marks of the Bladders ; in the 
next their Diameters ; in the third their Weights in 
Grains Troy, in the fourth the times of their Fall in 
Second Minutes of time ; and in the fifth, the difference 
of Time between the Falls of the Leads and of each 
Bladder , taken below by the Prefident, Dr. Halley, 
Dr. Jurin, Martin Folkes Efq; and Mr. George Graham 
the Clock-maker. The Time was taken above with 
Mr. Graham's Chronometer, (formerly deferibed) ; and 
below with the fame Indrument, and three half Second 
PendulumS) all which agreed very well together. 
The 
