--- = - ---- = -2 = --------, in which n' = 1, m' = 0,
m 30 m' - a'

1 - a 1
whence -2 = -------, 2a = 1 - a, 3a = 1, a = ---.
-a 3

And for the train A'B'F' (Eq. II.),

n 60 n' 1
--- = ---- = 6 = --------, in which a = ---, m' = 1,
m 10 m' - a' 3

n'
whence 6 = -----------, or n' = 4.
1 - (1/3)

That is, the last wheel F' turns _four_ times about the axis LL during
one revolution of the crank H. But according to Profs. Willis and
Goodeve, we should have for the second train:

n 60 n' - a 1
--- = ---- = 6 = --------, in which a = ---, m' = 1,
m 10 m' - a' 3

n' - (1/3)
which gives 6 = -----------, n' - (1/3) = 4, n' = 4-1/3,
1 - (1/3)

or _four and one-third_ revolutions of F' for one of H.

This result, no doubt, might be near enough to the truth to serve all
practical purposes in the application of this mechanism to its
original object, which was that of paring apples, impaled upon the
fork K; but it can hardly be regarded as entirely satisfactory in a
general way; nor can the analysis which renders such a result
possible.

* * * * *

THE PANTANEMONE.

The need of irrigating prairies, inundating vines, drying marshes, and
accumulating electricity cheaply has, for some time past, led to a
search for some means of utilizing the forces of nature better than
has ever hitherto been done. Wind, which figures in the first rank as
a force, has thus far, with all the mills known to us, rendered
services that are much inferior to those that we have a right to
expect from it with improved apparatus; for the work produced,
whatever the velocity of the wind, has never been greater than that
that could be effected by wind of seven meters per second. But, thanks
to the experiments of recent years, we are now obtaining an effective
performance double that which we did with apparatus on the old system.

Desirous of making known the efforts that have been made in this
direction, we lately described Mr. Dumont's atmospheric turbine. In
speaking of this apparatus we stated that aerial motors generally stop
or are destroyed in high winds. R