18
Only the "drum" type of armature is treated here.
19
This refers to continuous-current dynamos only.
20
The Robertson.
21
This resembles the upper part of the rudimentary water injector shown in Fig. 15. The reader need only imagine pipe B to be connected with the train pipe. A rush of steam through pipe A creates a partial vacuum in the cone E, causing air from the train pipe to rush into it and be expelled by the steam blast.
22
Glazebrook, "Light," p. 157.