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Updated: June 5, 2025


I expressed no surprise. "In what were they astray?" I asked. "The mammoth, as I saw it, had a huge hump like the steam-chest of an enormous engine over its shoulders." "And where did you see it, and when?" "You are curious to know?" "Yes, I think I am; and there is a quiet of expectancy abroad.

The steam is admitted and exhausted by a valve at each end of the cylinder placed directly below the port. The cut-off valve is behind the main valve: the mechanism for operating the valves is on the outside of the steam-chest, and easily accessible.

The person who essays a task that is beyond his capacity is certain to come to grief and to create no end of disturbance to himself and others before the final catastrophe. If the steam-chest or boiler is not equal to the task, wisdom and safety would counsel the installation of a larger one. Here is one of the tragedies of our scheme of education.

The first steam locomotive that we know about, like that of Stephenson, was a crude mechanism with a primitive boiler and steam-chest and drive-wheels, and as a whole it had but a low degree of efficiency measured by our modern standard; but as time went on inventive genius changed one little part after another until greater and greater efficiency was obtained, and at the present time we find many varied products of locomotive evolution.

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