}
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16
368
The floor of the top of the dam between the cofung courses mary be covered with a prix inch layer a barrelled surface, to
of fine concret rolled with
drain off surface waters.
Over the exping course on the reservoir orde a solid granite masonry parapet there feet high may be built as a
protection against the waves during forms while along the opposite edge of the dam it will pruffice to erect a light but strong iron handrail of one inch & a half water piping.
held by vertical iron standards solidly beaded into the cope stones.__
The whole of the joints
Tn.
both faces of the
wall must be raked out and cleaned as
far, as
the trowel will reach, and then carefully pointed with mortar composed of one part cement to her parts sand
on
should
On similar structures bult, the Continent I understand it has been found convenient to insert ringbelts at intervals along the face of the wall to facilitate the securing of scaffolding. such be at any time subsequently required for
e-pointing the masonry.
access to the face of the wall . _ If requisite there, is no objection
to the same being done in the present
The best position for ringbolts would be at intervals of every twenty fest along the eight ashlar betting courses that will intersect the rubble facer
18
te
gaining
case.
Quality of Mone. The stone to be used, in the
construction of the dam will be the sound blue granite quarried. on the spot. as also such suitable stone as may be selected from the material excavated out of the tunnel. - Que precaution must be taken against the use either for the masonry or
7
the concrete
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