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Plate VI. represents a plan of the chamber and foundation, though strictly it shows a section taken a few feet above the foundation, in order to represent the arrangement of the pipes. The smaller pipe is the main and is so placed as to receive the water from the inner chamber of the house.

The larger one is the waste pipe, sixteen inches in diameter; it is laid upon the foundation, and extends through the house without any immediate connection with it; though, should it ever become desirable to make such a connection, in order to obtain a greater supply than the twelve-inch can furnish, a short piece of flange pipe was inserted to render this possible without any serious inconvenience.

Plate III. represents a section through the house taken in such a way as to show the arrangement of the sluice-gates through which the water enters the chambers. There are three of these, each sixteen inches square, and beginning with the highest they are respectively 6.5, 13.5, and 21 feet below high water level. By means of these varying heights it is possible to always draw the water from such a distance below the surface as to obtain the best quality contained in the reservoir; and by regulating the height of draught to the rise and fall of the water, no inconvenience or annoyance will be experienced from such foreign substances as would be liable to float upon the surface of an impounding reservoir.

The heavier shading in the middle of the plate near the bottom indicates a section of the stop-wall, which is securely bonded into the side-walls, and built solid up to a height of five feet, or even with the bottom of the lower sluice-gate. Thus a chamber is formed which furnishes a place of deposit for any heavy matter which, by chance, may have been carried into the house by the current as well as any impurities which may have been arrested by the screens.

Resting upon this stop-wall are the screens, set in two lines, so that one of them can be removed for cleaning or repairing without shutting off the water. The screens are represented upon Plate IV. They are made of copper wire, firmly secured in wooden frames, which run in iron slides firmly bolted to the

masonry.

[graphic]
[graphic]

PLATE IV.-SECTION OF GATE-HOUSE THROUGH C D, PLATE VI.

[graphic]

PLATE V.-SECTION OF GATE-HOUSE THROUGH E F, PLATE VI.

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Plate V. shows a section taken behind the screens and indicates the shape of the sluice-gates with the stands and rods. In the construction of the gate chamber and house were employed about eighty cubic yards of stonework, forty-five cubic yards of brickwork, and about fifteen cubic yards of concrete, besides the iron fixtures.

The house, taken as a whole, is a very firm and substantial structure, and when the work is fully completed will present rather a pretty appearance, though to the ordinary individual who does not stop to consider the requirements of such a structure, it may seem somewhat heavy. But when one regards the tests to which such a building may be put, for instance, when the chambers are empty and the reservoir full, thus subjecting the walls to a pressure due to a head of twenty-five feet of water, all ideas of clumsiness vanish.

PLATE IX.

SECTION OF CANAL.

SECTION OF WASTE-WEIR.

WASTE-WEIR.

The waste-weir is to be built at the point indicated upon the plan of the reservoir, Plate I. Its construction will not probably

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