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A steam-carriage of ten horse power cannot under any circumstances, when it encounters a newly mended part of the road, or a softer soil, put forth an additional power for a minute or two, as a team of horses can do; so that equality of exertion is nearly indispensable for the full advantage of an engine.
Besides, he was most friendly, and took much delight in being concerned in my enterprise. This "big job" was executed in about four months. The steam-carriage was completed and exhibited before the members of the Society of Arts. Many successful trials were made with it on the queensferry Road, near Edinburgh.
Then, in 1784, William Symington, one of the early inventors of the steamboat, was similarly occupied in Scotland in endeavouring to develop the latent powers of the steam-carriage.
Professor Weber of Gottingen has thrown out a suggestion, that if a contrivance could be devised to enable us to convert at will the wheels of the steam-carriage into magnets, we should be enabled to ascend and descend acclivities with great facility. This notion may ultimately be, to a certain extent, realised.
If old Crasweller goes off in his steam-carriage, how am I to go after him, and whom am I to ask to help to bring him back again?" I was puzzled, but I did not care to show it. No doubt a hundred little arrangements would be necessary before the affairs of the institution could be got into a groove so as to run steadily.
"At the time the Committee sat in 1831, I could speak as to having seen only one steam-carriage on a turnpike road, and as to the effect on horses that passed it on the road. From considerable experience since that time, I am quite certain, that in a very short period there will be no complaint of horses being frightened by steam-carriages.
Thus the power of the engine was equal to the difference between the pressure of the atmosphere and the elasticity of the steam in the boiler. This steam-carriage excited considerable interest in the remote district near the Land’s End where it had been erected.
"There can be no doubt," say they, "that a well-constructed engine, a steam-carriage conveyance between London and Birmingham, at a velocity unattainable by horses, and limited only by safety, may be maintained; and it is our conviction that such a project might be undertaken with great advantage to the public, more particularly if, as might obviously be the case, without interfering with the general use of the road, a portion of it were to be prepared and kept in a state most suitable for travelling in locomotive steam-carriages."
Watt's pride in it as his favorite invention in these respects is fully justified. A detailed specification for a road steam-carriage concludes the claims of this patent, but the idea of railroads, instead of common roads, coming later left the construction of the locomotive to Stephenson. Watt's last patent bears date June 14, 1785, and was
I may mention that in my steam-carriage I employed the waste steam to create a blast or draught by discharging it into the short chimney of the boiler at its lowest part, and found it most effective.
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