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Updated: June 4, 2025
None of the Nautilus's men were to go with us on this new excursion. Soon we were imprisoned up to the neck in india-rubber clothing, and straps fastened the air devices onto our backs. As for the Ruhmkorff device, it didn't seem to be in the picture. Before inserting my head into its copper capsule, I commented on this to the captain.
Anyhow it lit our way, although hazily, but I soon grew accustomed to this unique gloom, and in these circumstances I understood the uselessness of the Ruhmkorff device. Side by side, Captain Nemo and I walked directly toward this conspicuous flame. The level seafloor rose imperceptibly.
The Ruhmkorff induction coil has in late years been greatly improved both by Tesla and Elihu Thomson, who, separately and independently of each other, have produced excellent forms of high-frequency induction coils.
It is, therefore, with great pleasure that I accede to the request of the editor of this Magazine to state briefly what has been achieved in the department of medicine up to the present time. The Crookes tube, actuated from a storage battery or other source of electricity through a Ruhmkorff coil, is placed on one side of the body.
When the apparatus is at work this gas becomes luminous, giving out a white and continuous light. Thus provided, I can breathe and I can see." "Captain Nemo, to all my objections you make such crushing answers that I dare no longer doubt. But, if I am forced to admit the Rouquayrol and Ruhmkorff apparatus, I must be allowed some reservations with regard to the gun I am to carry."
I immediately knew that the gallery was filled to overflowing with that dangerous gas the miners call fire damp, the explosion of which has caused such fearful and terrible accidents, making a hundred widows and hundreds of orphans in a single hour. Happily, we were able to illumine our progress by means of the Ruhmkorff apparatus.
Their intense brilliance had been followed by a reddish twilight, a midpoint between day and night. But we could see well enough to find our way, and it still wasn't necessary to activate the Ruhmkorff device. Just then Captain Nemo stopped. He waited until I joined him, then he pointed a finger at some dark masses outlined in the shadows a short distance away.
A Ruhmkorff coil may also be employed for obtaining sparks in proportion to the current emitted. The apparatus is regulated in precisely the same way as dial telegraphs, starting always from first contact.
M. Ruhmkorff is a learned and most ingenious man of science; his great discovery is his induction coil, which produces a powerful stream of electricity. He obtained in 1864 the quinquennial prize of 50,000 franc reserved by the French government for the most ingenious application of electricity.
As early as 1842, Masson and Bréguet constructed an induction coil by means of which minute sparks could be obtained from the secondary, in vacuo. In 1851, Ruhmkorff constructed an induction coil so greatly improved, by the careful insulation of its secondary circuit, that he could obtain from it torrents of long sparks in ordinary air.
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