This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1861 Excerpt: ...a a and the diagonal braces b b are keyed. The
arms are 2 inches, and the braces If inches in diameter. D
represents the buckets, with the shuttle which regulates the
admission of the water, and which is made to slide downwards, F the
termination of the stone breast, and E the tail-race. This wheel,
it will be seen, is arranged as a low-breast. The principle of the
construction of the buckets is more clearly shown on an enlarged
scale in fig. 3, Plate III., the soleplate being abandoned and the
bucket plates bent round and prolonged upwards so as to overlap one
another, leaving an opening, indicated by the arrows, for the
escape of the inclosed air. The bucket plates are connected
together by tubular ferules, or stays, through which a rivet is
passed, and riveted on each side. The wheel should always, as in
this plate, be placed above the tail water, and not, as in the
older forms of wheels (fig. 112), be carried down to the level of
the tail-race floor; and the breast of wood, iron, or stone, but
usually the latter, which is of so much importance for low falls in
retaining the water on the wheel, should break off about ten inches
from the extremity of a vertical diameter of the wheel. In fact,
the benefits of this form of breast and tail-race are so great they
should be strictly carried out where it is desirable to make
effective use of the fall. In high-breast wheels of twenty-five
feet in diameter, and upwards, the breast is not required, as the
buckets having narrower openings, and their lips extended nearer to
the back of the following buckets, retain the water longer on the
wheel. In this case the loss from spilling constitutes too small a
percentage of the power to compensate for the expense of a lofty
and closefitting breast. In some cases the breas...
|Country of origin:
||246 x 189 x 4mm (L x W x T)
||Paperback - Trade
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