The accompanying figure represents the experiment made under this form
in the great ampitheater of the Royal Institution at London.--_La
Lumiere Electrique_.
* * * * *
ELECTRICAL GRAPNEL FOR SUBMARINE CABLES AND TORPEDO LINES.
By H. KINGSFORD.
All those who are acquainted with the cable-lifting branch of submarine
telegraphy are well aware how important a matter it is in grappling
to be certain of the instant the cable is hooked. This importance
increases, of course, with the age and consequent weakness of the
material, as the injury caused by dragging a cable along the bottom is
obviously very great.
[Illustration: ELECTRICAL GRAPNEL FOR SUBMARINE CABLES AND TORPEDO
LINES.]
It is easy also to understand the fact that in nearly all cases the most
delicate dynamometers must fail to indicate immediately the presence
of the cable on the grapnel, more especially in those cases where a
considerable amount of slack grapnel rope is paid out.
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