[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
arm is in motion as they would be if it were fixed. Now, in Fig. 14,
let A be the first and F the last wheel of an _incomplete_ train, that
is, one having but one sun-wheel. As before, let these be so connected
by intermediate gearing that, when T is stationary, a rotation of A
through _m_ degrees shall drive F through _n_ degrees: and also as
before, let T in the same time move through _a_ degrees. Then, if _m'_
represent the total motion of A, we have again,
m' = m + a, or m = m' - a.
This is, clearly, the motion of A relatively to the fixed frame of the
machine; and is measured from a fixed vertical line through the
center of A. Now, if we wish to express the total motion of F
relatively to the same fixed frame, we must measure it from a vertical
line through the center of F, wherever that maybe; which gives in this
case:
n' = n + a, or n = n' - a.
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