[Illustration: THE GENERATION OF STEAM. Fig 3.]

[Illustration: THE GENERATION OF STEAM. Fig 4.]

[Illustration: THE GENERATION OF STEAM. Fig 5.]

[Illustration: THE GENERATION OF STEAM. Fig 6.]

[Illustration: THE GENERATION OF STEAM. Fig 7.]

_(To be continued.)_

* * * * *

[Continued from SUPPLEMENT No. 437, page 6970.]




PLANETARY WHEEL-TRAINS.

By Prof. C.W. MACCORD, Sc.D.


II.

[Illustration: PLANETARY WHEEL TRAINS. Fig. 14]

It has already been shown that the rotations of all the wheels of a
planetary train, relatively to the train-arm, are the same when the