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I have it upon the table; the mixture was ignited at the proper time by the electric spark produced from a primary battery and Ruhmkorff coil. The Hugon engine was an advance in this respect, using a flame ignited, and securing greater certainty of action in a comparatively simple manner. It is really a modification of Barnett's lighting cock described in his patent of 1838.
I soon became the possessor of a second-hand Ruhmkorff induction coil, which, although it would only give a small spark, would twist the arms and clutch the hands of a man so that he could not let go of the apparatus.
Three holes, protected by thick glass, allowed us to see in all directions, by simply turning our head in the interior of the head-dress. As soon as it was in position, the Rouquayrol apparatus on our backs began to act; and, for my part, I could breathe with ease. With the Ruhmkorff lamp hanging from my belt, and the gun in my hand, I was ready to set out.
By turning a screw I established a communication between the wire and the spiral glass, and the sea, lit by our four lanterns, was illuminated for a circle of thirty-six yards. As we walked I thought the light of our Ruhmkorff apparatus could not fail to draw some inhabitant from its dark couch. But if they did approach us, they at least kept at a respectful distance from the hunters.
Placed on our backs, the Rouquayrol device went into operation as soon as it was in position, and for my part, I could breathe with ease. The Ruhmkorff lamp hanging from my belt, my rifle in hand, I was ready to go forth. But in all honesty, while imprisoned in these heavy clothes and nailed to the deck by my lead soles, it was impossible for me to take a single step.
"With the Ruhmkorff apparatus, M. Aronnax; one is carried on the back, the other is fastened to the waist. It is composed of a Bunsen pile, which I do not work with bichromate of potash, but with sodium. A wire is introduced which collects the electricity produced, and directs it towards a particularly made lantern. In this lantern is a spiral glass which contains a small quantity of carbonic gas.
"I've no more objections to raise," I replied. "I'll only ask you, captain: how can you light your way at the bottom of the ocean?" "With the Ruhmkorff device, Professor Aronnax. If the first is carried on the back, the second is fastened to the belt. It consists of a Bunsen battery that I activate not with potassium dichromate but with sodium.
Pilleux's experiments and my own so great an analogy that we might draw the deduction therefrom that induced currents in alternating machines have, like those of the Ruhmkorff coil, a definite direction, which would be that of currents having the greatest tension, that is to say, that of direct currents. This hypothesis seems to us the more plausible in that Mr.
Doctor Beard in his previously mentioned treatise refers, on page 27, to the views of others who have repeated Edison's experiments and observed the phenomena, and in a foot-note says: "Professor Houston, of Philadelphia, among others, has repeated some of these physical experiments, has adopted in full and after but a partial study of the subject, the hypothesis of rapidly reversed electricity as suggested in my letter to the Tribune of December 8th, and further claims priority of discovery, because he observed the spark of this when experimenting with a Ruhmkorff coil four years ago.
To attempt under these circumstances to light a torch was simply impossible, and the last remains of our electric machine, of our Ruhmkorff coil, had been destroyed during the fearful explosion. I was therefore very much confused to see at last a bright light shining close to me. The calm countenance of the guide seemed to gleam upon me.
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