The Atlantic Telegraph (1865)Russell, William Howard, Sir
History
The Atlantic Telegraph (1865)
Russell, William Howard, Sir
Transatlantic cables
The Cable passed over the wrought-iron V wheel over the tank along the
trough, between the V wheels and jockey wheels in a straight line; four
turns round the drum where the knife comes into action over the first
intermediate wheel, under the dynamometer wheel, and over the other
intermediate and stern wheels into the sea.
[Illustration: From a drawing by R. Dudley London, Day & Sons, Limited,
Lith.
PAYING-OUT MACHINERY.]
[Illustration: T. Picken, lith from a drawing by R. Dudley London, Day &
Sons, Limited, Lith.
COILING THE CABLE IN THE AFTER TANK ON BOARD THE GREAT EASTERN AT
SHEERNESS. VISIT OF H.R.H. THE PRINCE OF WALES ON MAY 24th.]
This dynamometer was only a heavy wheel resting on the rope, but fixed
in an upright frame, which allowed it to slide freely up and down, and
on this frame were marked the figures which showed exactly the strain in
pounds on the Cable. Thus, when the strain was low the Cable slackened,
and the dynamometer sunk low with it; when, on the contrary, the strain
was great, the Cable was drawn “taut,” and on it the dynamometer rose to
its full height. When it sunk too low, the Cable was generally running
away too fast, and the brakes had to be applied to check it; when, on
the contrary, it rose rapidly the tension was dangerous, and the brakes
had to be almost opened to relieve it. The simplicity of the apparatus
for opening and shutting the brakes was most beautiful. Opposite the
dynamometer was placed a tiller-wheel, and the man in charge of it
never let it go or slackened in his attention for an instant, but
watched the rise and fall of the dynamometer as a sailor at the wheel
watches his compass. A single movement of this wheel to the right put
the brakes on, a turn to the left opened them. A good and experienced
brakeman would generally contrive to avoid either extreme of a high or
low strain, though there were few duties connected with the laying of
submarine cables which were more anxious and more responsible while they
last, than those connected with the management of the brakes. The whole
machine worked beautifully, and with so little friction that when the
brakes were removed, a weight of 200 lb. was sufficient to draw the
Cable through it.
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