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8I cannot here omit a brief explanation, as clearly as I can give it, of the principles on which hydraulic organs are constructed. A base of framed wood-work is prepared, on which is placed a brazen box. On the base, right and left, uprights are fixed, with cross pieces like those of a ladder, to keep them together; between which are enclosed brass barrels with moveable bottoms, perfectly round, having iron rods fixed in their centres, and covered with leather and woollen, attached by pins to the levers. There are also, on the upper surface, holes about three inches diameter, in which, near the pin-joint, are brazen dolphins with chains hanging from their mouths, which sustain the valves that descend below the holes of the barrels.
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