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Updated: June 15, 2025
It must not be imagined, however, that all this worked out as quickly as it sounds. The speed of the moving work had to be carefully tried out; in the fly-wheel magneto we first had a speed of sixty inches per minute. That was too fast. Then we tried eighteen inches per minute. That was too slow. Finally we settled on forty-four inches per minute.
In a rough and rudimentary way an attempt to provide for the special effort required at steep or stony places was made by the introduction of a kind of fly-wheel of extraordinary weight proportionate to the size of the engine; and the same object was aimed at by increasing the power of the engine to somewhere near the limit of the possible special requirements.
It was in 1890 that I began on a double-cylinder engine. It was quite impractical to consider the single cylinder for transportation purposes the fly-wheel had to be entirely too heavy. Between making the first four-cycle engine of the Otto type and the start on a double cylinder I had made a great many experimental engines out of tubing. I fairly knew my way about.
Then he blew a great cloud of smoke, and sat down in a different chair "I wonder whether a fourth would act as a fly-wheel," and he looked straight at me, as if asking my opinion. I had never been in direct relations with a Mussulman of education and position.
It is found in practice, that when the power resident in the fly-wheel rim, when the engine moves at its average speed, is from two and a half to four times greater than the power generated by the engine in one half-stroke the variation, depending on the energy inherent in the machinery the engine has to drive and the equability of motion required the engine will work with sufficient regularity for most ordinary purposes, but where great equability of motion is required, it will be advisable to make the power resident in the fly-wheel equal to six times the power generated by the engine in one half-stroke.
The larger specimens had a case to themselves, and tickets with writing on them in a character which I could not understand. There were fragments of steam engines, all broken and rusted; among them I saw a cylinder and piston, a broken fly-wheel, and part of a crank, which was laid on the ground by their side.
In the steam-engine and in other machines of similar type, the problem is simplified by the uniform length of the stroke made by the piston, so that devices such as the crank and eccentric circular discs are readily applicable to the securing of a rotatory motion for a fly-wheel from a reciprocating motion in the cylinders.
The designer was one El Osta Abdullah, a former employee of General Gordon's in Khartoum Arsenal. There were several steam engines; the principal one driving the main shafting was of 28 horse-power. The fly-wheel was 4 feet in diameter. There were five lathes, one cat-head lathe 36 inch, three drills, and other tools including a slotting machine, all in perfect going order.
The drum may carry a crank and shaft, which works the spur-wheel and toothed bands as already described, so that no matter at what stage in the revolution of the drum an upward or downward stroke may be stopped, the motion will still be communicated in a continuous rotary form to the fly-wheel.
Richard shrugged a shoulder; it was too great an effort to shrug both of them. "And I guess you ain't going to stop the fly-wheel of my destiny." "You've had a sample," he replied with a touch of spirit. Hipps came a step closer and hooked his foot round a leg of Richard's chair. "Know anything about the third degree?" he demanded. "What you've shown me."
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