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"You see," said the Captain, "I use Bunsen's contrivances, not Ruhmkorff's. Those would not have been powerful enough. Bunsen's are fewer in number, but strong and large, which experience proves to be the best. The electricity produced passes forward, where it works, by electro-magnets of great size, on a system of levers and cog-wheels that transmit the movement to the axle of the screw.
At this precise moment the journey commences." So saying, my uncle took in one hand Ruhmkorff's apparatus, which was hanging from his neck; and with the other he formed an electric communication with the coil in the lantern, and a sufficiently bright light dispersed the darkness of the passage. Hans carried the other apparatus, which was also put into action.
"At least," I said, "don't let us lose a minute." "Yes, yes, lad," he replied; "but first let us examine this new gallery, to see if we shall require our ladders." My uncle put his Ruhmkorff's apparatus in action; the raft moored to the shore was left alone; the mouth of the tunnel was not twenty yards from us; and our party, with myself at the head, made for it without a moment's delay.
Then if a hydrocarbon is present, the passage of a spark from a Ruhmkorff's coil will cause the appearance of a sky-blue light. Viewed with the spectroscope, this presents the spectrum of carbon, and generally so brilliant as to mask totally the spectra of other gases present. The rare metals cerium, lauthanum, and didymium have been lately investigated by Drs.
Then there was a row of phials containing dextrine, alcoholic ether, liquid acetate of lead, vinegar, and ammonia drugs which afforded me no comfort. Finally, all the articles needful to supply Ruhmkorff's apparatus. My uncle did not forget- a supply of tobacco, coarse grained powder, and amadou, nor a leathern belt in which he carried a sufficient quantity of gold, silver, and paper money.
Ruhmkorff's apparatus consists of a Bunsen pile worked with bichromate of potash, which makes no smell; an induction coil carries the electricity generated by the pile into communication with a lantern of peculiar construction; in this lantern there is a spiral glass tube from which the air has been excluded, and in which remains only a residuum of carbonic acid gas or of nitrogen.
Even in November they feared to work by day, lest the sun's rays acting on the gun-cotton might lead to unhappy results. This led to their working at night, by light produced in a vacuum by means of Ruhmkorff's apparatus, which threw an artificial brightness into the depths of the Columbiad.
I immediately recognised in this gallery the presence of a considerable quantity of the dangerous gas called by miners firedamp, the explosion of which has often occasioned such dreadful catastrophes. Happily, our light was from Ruhmkorff's ingenious apparatus.
Every steam-engine had been excluded, and the least fires extinguished for two miles round. Even in November it was necessary to preserve this gun-cotton from the ardour of the sun. So they worked at night by light produced in a vacuum by means of Rühmkorff's apparatus, which threw an artificial brightness into the depths of the Columbiad.
My uncle was carrying one of Ruhmkorff's lamps and I the. other. I was examining the beds of granite. Suddenly turning round I observed that I was alone. Well, well, I thought; I have been going too fast, or Hans and my uncle have stopped on the way. Come, this won't do; I must join them. Fortunately there is not much of an ascent. I retraced my steps. I walked for a quarter of an hour.
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