t *93 1 
two bare fides together, laid them upoii 
four wine-glaffes, which fupported them 
at the corners. He then brought down a 
chain from the prime conductor nearly 
to touch the coating of the upper plate, 
and applying a wire which he held in his 
hand to the coating of the under plate, 
the machine was put in motion, and the 
electrification performed, as in the ufe of 
the common eleitrical pane. 
When the operation was completed, he 
removed the chain and the wire, and taking 
hold of two oppofite corners of the upper 
glafs (thofe correfponding to them in the 
other having been purpofely cut away), he 
lifted it, and found that the under glafs 
came up with it. The cohefion appeared 
to him confiderably ftrong, but he had not 
any proper apparatus to meafure the 
flrength of it. He laid them down again 
on the wine-glaffes, and procured an ex- 
plofion, as in the common eledtrical pane. 
O He 
