...expansively, whose elastic force is 2J times as great as that of steam used unexpansively, if it be cut off when the piston has moved two-fifteenths of the whole...therefore of fuel, in the former case is only onethird (= 2-J- x TS) of the consumption in the latte'r case. It must be observed, however, that, in order...

...—e — &c. J\ Jt The potential on the outside of the sphere due to the superficial electrification will be the same as that which would be produced by the system of images i?,, _B 2 , &c. This system is therefore called the electrical image of the system...

...the centre of the sphere, and their charges will be -e l -f> —e 2 j,&c. aa . Jl /2 electrification will be the same as that which would be produced by the system of images B lt B 2 , &c. This system is therefore called the electrical image of the system...

...distances -,-, -7-, &c. /I /2 from the centre of the sphere, and their charges will be a electrification will be the same as that which would be produced by the system of images B^, B 2 , &c. This system is therefore called the electrical image of the system A...

...cen' of this energy reappears as heat through unavoidable losses in the tunnel, the heating effect will be the same as that which would be produced by the combustion of 50 tons of coal per day in the tunnel, and devoted to the warming of the contained mass...