D E £ 
609 
Abridg, 
Tranf. 
Des-aguliers, J. T. LL. D. A proportion on the 
balance, not taken notice of by mechanical 
writers, explained and confirmed 
— Obfervations on the crane, with improvements 
on that machine 
— - Examination of a new-invented axis in peritro- 
chio, faid to be void of fridfion 
An account of an experiment explaining a 
mechanical paradox, viz. that two bodies of 
equal weight, fufpended on a certain fort of 
balance, do not lole their equilibrium, by be- 
ing removed one farther from, the other nearer 
to, the center - - 
An experiment to fhew that the friftion of the 
feveral parts in a compound machine, may be 
reduced to calculation 
■ — Two experiments of the fridlion of pullies 
— An account of an experiment, contrived by 
G. J. s’Gravefande, relating to the force of 
moving bodies* fhewn to the Royal Society 
— An account of an inftrument, or machine, 
for changing the air in the room of Tick 
people - - 
— A calculation of the velocity of the air, moved 
by a new-invented centrifugal bellows of feven 
feet in diameter, and one foot thick within, 
which a man can keep in motion with very 
little labour, at the rate of two revolutions in 
one fecond - 
The ufes of the foregoing machine 
An experiment to drew, that fome damps in 
mines may be occafioned only by the burning 
of candles under ground, without the addi 
tion of any noxious vapour, even when the 
bottom of the pit has a communication with 
the outward air, unlefs the outward air be 
forceably driven in - 
An attempt to explain the phenomenon of the 
horizontal moon appearing bigger when near, 
than when elevated many degrees above, the 
horizon; fupported by an experiment, with an 
explication - 
•— Account of fome new flatical experiments 
— An arcount of fome magnetical experiments 
made before the Royal Society, June 24, 
1736, and April 21, 1737 
XXXVI 128 
— 194 
222 
228 
XXXVII 1 25 
— - 292 
— 394 
XXXVIII 
143 
XXXIX 41 
— 44 
~ 47 
— 281 
— 390 
XL 62 
- 3 8 .? 
vr 317 
— 32° 
— 3 10 
— 321 
— 322 
VIII 235 
— 270 
— 271 
— 2 73 
— 74° 
Desa- 
4H 2 
