independently, and WITHOUT any ground-connection.
Now, then, observe the economy of it. A cavalry
charge hurls itself against the fence; you are using no
power, you are spending no money, for there is only
one ground-connection till those horses come against
the wire; the moment they touch it they form a con-
nection with the negative brush THROUGH THE GROUND,
and drop dead. Don't you see? -- you are using no
energy until it is needed; your lightning is there, and
ready, like the load in a gun; but it isn't costing you
a cent till you touch it off. Oh, yes, the single
ground-connection --"

"Of course! I don't know how I overlooked that.
It's not only cheaper, but it's more effectual than the