I i8 7 ] 
force than it did before it was lined, every other cir- 
cumftance alike. When firft I made this obfervation, 
it induced me to try what effeCt the lining would 
have upon fome cylinders, which I had found fo bad 
that I had laid them afide as ufelefs. 
Upon being lined, they proved much better than 
any I ever had of the fame fize before. 
2dly, Electrical machines, when laid by for any 
conliderable time, are very apt to be out of order, and 
fometimes require much trouble before they can be 
brought to aCt : this inconvenience is in a great 
nieafu re removed by thus lining the glafs. 
3dly, The cylinders thus lined are by far lefs liable 
to break by any alteration of weather, or in working 
the machine, which often was the cafe with mine 
before I lined them. 
4thly, As a fmall cylinder thus prepared is equal in 
power to one much larger, that is not, and requires lefs 
friction, the apparatus in which it is mounted may 
be much contracted, and the whole, together with 
the perfon that turns the machine, may be eafilv 
fupported upon one or two fmall Itools with glafs 
feet, when experiments require it. With a lined 
cylinder 74 inches in diameter, and about 9 inches 
long, I have loaded three jars, that held four gallons 
each, to that degree as to burlt one of them, which 
made an explofion near to that of a pocket piftol. The 
cylinder was mounted in a brafs frame with a wheel 
and pinion ; the wheel was turned with eafe by a fmall 
brafs winch, and the rotation of the winch to that of 
the cylinder was as one to three, 
II. As railing the greateft quantity of eleCtrical fire 
was the objeCt of the firft improvement, the next 
B b 2 thing 
