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Updated: May 13, 2025
With only half the resistance against it, the motor was now racing hard. Dick slowed it down, and then the work of repairing the broken sprocket chain and gear was undertaken. It was not necessary to stop the airship to do this. In fact to stop meant to descend, and they wanted to put that off as long as possible. They still had the one permitted landing to their credit.
"This is a film made with the co-operation of Doctor Nagoya of the Castleton Institute and I am told by Mr. Manton that it is one of the finest snake pictures ever made." Kennedy spoke fast, so that we would get the full benefit of his explanation and so that it would not be necessary to subject the negative to the wear and tear of the sprocket wheels in the projection machine again.
Chanute's departure, we suspended one of the drive chains over a sprocket, hanging bags of sand on either side of the sprocket of a weight approximately equal to the pull that would be exerted on the chains when driving the propellers. By measuring the extra amount of weight needed on one side to lift the weight on the other, we calculated the loss in transmission.
Swift showed Tom how to figure out the number of teeth needed on each sprocket, in order to get an increase of speed, and as there was a sprocket wheel from a disused piece of machinery available, Tom took that. He soon had it in place, and then tried the motor. To his delight the number of revolutions of the rear wheel were increased about fifteen per cent.
"No more do I. That's the dreadful thing about it. You've got to listen to chaps that you don't know. Why, coming home on my bicycle the other day there was an awful row between some infernal 'sprocket' and the 'ball bearings' of the machine, and I never knew before there were such things in the whole concern."
The lamplighter passed me with a soft buzz and click of sprocket wheels, and looking back at him idly, I caught the sound of the church-clock at Barnet striking the hour. The chime focussed my thoughts on the great peace of the land. Here at any rate, I thought, man has topped the rise. He has accomplished all he set out to do and the result is peace and happiness.
Mollie seized the crank, which, by means of a long shaft and sprocket chain, extending from the after cabin bulkhead to the flywheel, revolved that. She gave it a vigorous turn. There was no welcome response of throbbing explosions in the cylinders. "Try again!" gasped Betty, "Oh, all of you try. I simply can't leave the wheel." The steamer was now sending out a concert of sharp, staccato blasts.
What interested Dave immensely was a self starting apparatus. This was operated by a handle inserted in a socket, fastened on a special ball ratchet on the large sprocket. Pulling this handle turned the motor over two, sometimes three compressions, and started up the machine without difficulty, Mr. Randolph explained.
This is accomplished by means of a sprocket chain gear and a crank connected to the engine shaft. The turning handle is within reach of the aviator. But Mr. Vardon, and Dick, working together, had evolved something better than this.
On one occasion, in fact, the operator who was turning the mechanism he sat on a bicycle frame, the sprocket of which was connected by a chain with the interior machinery during a battle, was knocked from his place by the concussion of a shell that exploded nearby; nevertheless, the film was saved, and the same man rode on horseback nearly seventy-five miles across country to the nearest railroad point so that the precious photographic record might be sent to London and shown to waiting audiences there.
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