Notes
1
"The Steam-Engine," p. 3.
2
By "weight of steam" is meant the steam produced by boiling a certain weight of water. A pound of steam, if condensed, would form a pound of water.
3
Also called ports.
4
The bores of the cylinders are in the proportion of 4: 6: 9. The stroke of all three is the same.
5
The ends furthest from the eccentric.
6
"The Locomotive of To-day," p. 87.
7
Even at this speed the wheel has a circumferential velocity of two-thirds that of a bullet shot from a Lee-Metford rifle. A vane weighing only 250 grains (about ½ oz.) exerts under these conditions a centrifugal pull of 15 cwt. on the wheel!
8
Steam-driven cars are not considered in this chapter, as their principle is much the same as that of the ordinary locomotive.