The position being ascertained, if it be not
desired to lift the cable, the grapnel can be released and hove on board
by a tripping line, which can always be attached when such work is
contemplated. The great importance of being able to localize an enemy's
torpedo lines without raising an alarm will be readily seen by engineers
engaged in torpedo work.
REFERENCES TO THE DIAGRAMS.
a, stem of the grapnel containing core; b, flukes; c, recess for
insulated contact-plate connected to core; d, covering plate screwed on
bottom of grapnel; e, button of plug; f, rubber washer and button; g,
metal-plate; h, stem of plug, on which in the under counter-sink, U is
a small metal disk which prevents the fittings from fallings out; i,
needle; j, spring; k, counter-sink for head of plug; l, counter-sink for
spring.
* * * * *
HUGHES' NEW MAGNETIC BALANCE.
A new magnetic balance has been described before the Royal Society
by Prof. D. E.
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