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Updated: May 28, 2025
My mistake may have been to put all my conversational eggs in one basket which, indeed, is a very good way to bore people. Dynamo Doit, teaching his class of industrious correspondents, would probably write them, with a picture of himself shaking his fist to emphasize his point: 'Do not try to exhaust your subject. You will only exhaust your audience.
In the engine room there are six engines one for driving the boat, two for compressing the air for the torpedoes, an engine for working the dynamo for producing the electric light, an engine for forcing air into the stoke-hole, and an engine working in conjunction with the distilling apparatus for supplying drinking water for the crew and the waste incidental to the boiler.
In it the current produced by the dynamo machine, fixed at a convenient station and driven by a steam engine or other motor, was conveyed to a dynamo placed upon the moving car, through a central rail supported upon insulating blocks of wood, the two working rails serving to convey the return current.
Each had forty tons of heavy oil for surface propulsion and charging the dynamo which supplied the electric engines under water. Each had also eighteen torpedoes as explained and five hundred rounds for the collapsible quick-firing twelve- pounder which we carried on deck, and which, of course, disappeared into a water-tight tank when we were submerged.
It is hardly probable that any one would lay down a complete plant, consisting of a steam or gas engine and dynamo, for the sole purpose of charging the boat cells, unless such a boat were in almost daily use, or unless several boats were to be supplied with electrical power from one station.
And even when his work-time was over, which was rare, he loitered about the shed. Then, the next time Holroyd maltreated him, Azuma-zi went presently to the Lord of the Dynamos and whispered, "Thou seest, O my Lord!" and the angry whirr of the machinery seemed to answer him. Thereafter it appeared to him that whenever Holroyd came into the shed a different note came into the sounds of the dynamo.
"I'll turn 'em up, Dick." And with the increased speed of the big motor that was whirling the propellers came increased danger of a break. Vigilance was redoubled, and they had their reward for their care. "Here's something wrong!" cried Innis, as he passed a small dynamo that supplied current for the electric lights. "A hot bearing!" and he pointed to where one was smoking. "Shut down!
A footnote in a current encyclopedia states that: "An account of the Magneto-electric machine of M. Gramme, in the London Standard of April 9th, 1873, confirmed by other information, leads to the belief that a decided improvement has been made in these machines." The word "dynamo" was then unknown.
This was a strange night, crude as if some coarse but powerful human intelligence were co-operating with nature. She had a fancy that if she strained her ears she might hear the whirr of the great dynamo that served this huge electric moon. But however the night might be, this strange, dangerous son of hers was a match for it.
Siemens also originated the mechanical idea of hollowing out the legs of the magnet on the inside for the armature to turn in close to the magnet, almost fitting. It was the first time any of these things had been done, and their author probably had no idea that they would be prominent features of the dynamo of a little later time, in all essentials closely imitated.
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