5 meter, and, through a sluice, joins the Osaka Bay Canal, after
a stretch of 2 kilometers.
[Illustration: FIG. 3.--AQUEDUCT OVER THE VALLEY OF THE TOMBS OF THE
EMPERORS.]
The second branch traverses a small tunnel, crosses the valley of the
emperors' tombs upon an aqueduct of 14 arches (Fig. 3), and reaches
Kogawa, a faubourg north of Kioto, after a stretch of 8 kilometers.
Its slope is greater than that of the main canal, from which it
derives but 1.4 cubic meter. The 7 cubic meters remaining may be
employed for the production of motive power under a fall of 56 meters.
It is proposed to utilize a portion of it, at the point of bifurcation
and at the top of the inclined plane, in a hydraulic installation that
will drive electric machines. The total cost of the work was one
million dollars, a third of which was furnished by the imperial
treasury, a quarter by the central government, and the rest by various
taxes.--_La Nature._
* * * * *
HOW TO FIND THE CRACK.--Most mechanics know that by drilling a hole at
the inner end of a crack in cast metal its extension can be prevented.
But to find out the exact point where the crack ends, the _Revue
Industrielle_ recommends moistening the cracked surface with
petroleum, then, after wiping it, to immediately rub it with chalk.
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