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In a shunt circuit with the receiving instrument he introduced electromagnets. The pulsations of current passed through the helices of these magnets, producing an augmented marking effect upon the receiving tape, but upon the breaking of the current, the magnet, in discharging itself of the induced magnetism, would set up momentarily a counter-current of opposite polarity.
"There's no telling, but those things on the top of the masts look like revolving helices," replied Redgrave, after a long look through his telescope. "He's screwing himself up into the air. That shows that they must either have stronger and lighter machinery than we have, or, as the astronomers have thought, this atmosphere is denser than ours, and therefore easier to fly in.
There is another system which is likewise in use in the French navy, and that is the Whitehead torpedo. This consists of a metallic cylinder, tapering at each end, and containing not only a charge of gun cotton, but a compressed air engine which actuates two helices.
With a view to proving this experimentally, Faraday constructed three flat helices and placed them parallel to each other a convenient distance apart. The middle helix was so arranged that a voltaic current could be sent through it at pleasure.
Of all Australian Helices, this is perhaps the most curious. Its outline and aspect are singularly like those of a Trochus of the Ziziphinus group. The colour is also very singular, being a yellowish flesh hue deepening on the base to rich brownish-yellow, and speckled irregularly with minute black dots which are areolated with white, the white ring being largest on the side towards the mouth.
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