This latter consists of a simple brass or galvanized iron wire, f f,
perfectly taut, and made fast in the top of the tube. After traversing
as many stories as necessary this wire terminates, in the interior of
the room where the observations are made, in a copper rod to which is
fastened a horizontal arrow, F. The wire traverses the floorings through
small zinc tubes; and, in the rooms through which it passes, it is
protected by iron tubes. To the ceiling of the observing room there is
affixed a wind-rose, R, on which the arrow reproduces all the motions of
the vane.
[Illustration: RICHARD'S WEATHERCOCK.]
This apparatus is now in operation in the different stations that the
Versailles waterworks has established near the reservoirs of the plateau
of Trappes, and it is also installed in several primary normal schools,
where it is giving very good results.--_La Nature_.
* * * * *
CHARRED CLOVER.
A correspondent of the _Ohio Farmer_ reports an experiment in curing
clover, showing how he just missed breeding fire in his barn, and
illustrating the importance of ventilating hay mows:
In 1861 I used a horse fork for the first time.
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