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In land and marine boilers, however, the safety valve is always kept down by weights; but in steam vessels a good deal of steam is lost in stormy weather by the opening of the valve, owing to the inertia of the weights when the ship sinks suddenly in the deep recess between the waves. Q. What other sizes of safety valves are used in locomotives?
Who has not seen locomotives coming quietly out of their roundhouses in New York and begin chasing people, chasing whole towns, tearing along with them, making everybody hurry whether or no, speeding up and ordering around by the clock great cities, everybody alike, the rich and the poor, the just and the unjust, for hundreds of miles around?
I found General Hunter's army encamped there, scattered over the fields along the banks of the Monocacy, with many hundreds of cars and locomotives, belonging to the Baltimore and Ohio Railroad, which he had taken the precaution to bring back and collect at that point. I asked the general where the enemy was. He replied that he did not know.
Then two great locomotives came snorting out of the shadows that wrapped the climbing track, and he grasped the shoulder of his comrade, who did not appear disposed to get up. There was a little pointed badinage between those who were starting for the mine and the loungers, and in the midst of it the big cars rolled into the station.
In this are dolls, boats, trumpets, drums, balls, toy houses, flags, the animals in Noah's Ark, building blocks, toy castles and battleships, story and picture books, little locomotives, cars, trains, automobiles, aeroplanes, rocking horses, windmills, besides cookies, candies, marbles, tops, fans, lace, and more nice things than one can count.
For two years I kept experimenting with various sorts of boilers the engine and control problems were simple enough and then I definitely abandoned the whole idea of running a road vehicle by steam. I knew that in England they had what amounted to locomotives running on the roads hauling lines of trailers and also there was no difficulty in designing a big steam tractor for use on a large farm.
But the objections in taste, and difficulties in science, have vanished. On this line, as on all others, tenants are readily found for houses fringing a cutting; locomotives run up even such ascents as the Bromsgrove Lickey, between Worcester and Birmingham, with a load of 500 tons. So ten minutes have been saved in time, and much expense, by doing away with the rope traction system.
All night long the Rosemary, drawn by the sturdiest of mountain-climbing locomotives, had stormed onward and upward from the valley of the Grand, through black defiles and around the shrugged shoulders of the mighty peaks to find a resting-place in the white-robed dawn on the siding at Argentine.
If I also would be sane to Sandy I must keep my superstitions about unenchanted and unmiraculous locomotives, balloons, and telephones, to myself.
The number of square feet of heating surface per square foot of fire grate, is from 13 to 15 square feet in wagon boilers; about 40 square feet in Cornish boilers; and from 50 to 90 square feet in locomotive boilers. About 80 square feet in locomotives is a very good proportion. Q. What is the heating surface of boilers per horse power?
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