Pile-saw.
The saw for cutting off piles below the surface of the water was invented by Labelye in planning the operation for establishing foundations for the piers of the
Westminster Bridge, 1738, and improved by De Cessart, when building the bridge
[
1703]
of
Saumur, 1756– 64.
In a simple form the machine consists of a frame composed of two longitudinal and three transverse timbers; to the central transverse piece are attached two uprights projecting above and below the frame, the saw being inserted between their lower ends, and their upper ends connected by a tension-rod for stretching the saw; handles are attached to the longitudinal piece of the frame, through which a reciprocating motion is given to the apparatus by the workmen, who stand on a platform.
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Pile-driver. |
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Pile-saw. |
Fig. 3719 is
Vogler's pile-sawing attachment for boats.
The circular saw is keyed on an upright shaft in a frame rigged outboard from the boat; it is secured between spiral springs above and below, which yield to the movements of the boat while cutting is going on, and is driven by belting from a shaft at that side of the frame nearest the boat, and rotated by bevelgears operated by machinery on board.
