This apparatus is shown
in Fig. 4, and a diagram of it is given in Fig. 3, so that its operation
may be better understood. The Thibaudier sounding apparatus consists of
a pulley, P (Fig. 3), over which is wound 10,000 meters of steel wire
one millimeter in diameter. From this pulley, the wire runs over a
pulley, B, exactly one meter in circumference; from thence it runs to a
carriage, A, which is movable along wooden shears, runs up over a fixed
pulley, K, and reaches the sounding lead, S, after traversing a guide,
g, where there is a small sheave upon which it can bear, whatever be the
inclination of the boat. The wheel, B, carries upon its axle an endless
screw that sets in motion two toothed wheels that indicate the number
of revolutions that it is making. One of these marks the units and the
other the hundredths (Fig. 5). This last is graduated up to 10,000
meters. As every revolution of the wheel, B, corresponds to one meter,
the number indicated by the counter represents the depth. Upon the axle
of the winding pulley there is a break pulley, p.
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