Watt’s Engines Used in Mining

In a few years he transformed his engines into universal motive powers and of indefinite force.

Continuing Watt Improves Steam-Engine,
our selection from Biographies of Distinguished Men by François Arago published in 1857. The selection is presented in four easy 5-minute installments. For works benefiting from the latest research see the “More information” section at the bottom of these pages.

Previously in Watt Improves Steam-Engine.

Time: 1774
Place: Soho

As soon as Parliament had granted a prolongation of twenty-five years to Watt’s patent, he and Boulton together began the establishments at Soho, which have become the most useful school in practical mechanics for all England. The construction of draining-pumps of very large dimensions was soon undertaken there, and repeated experiments showed that, with equal effect, they saved three-quarters of the fuel that was consumed by Newcomen’s previous engines. From that moment the new pumps were spread through all the mining counties, especially in Cornwall. Boulton and Watt received as a duty the value of one-third of the coal saved by each of their engines. We may form an opinion of the commercial importance of the invention from an authentic fact: in the Chace-water mine alone, where three pumps were at work, the proprietors found it to their advantage to buy up the inventor’s rights for the annual sum of sixty thousand francs (two thousand four hundred pounds). Thus, in one establishment alone, the substitution of the condenser for internal injection had occasioned an annual saving in fuel of upward of one hundred eighty thousand francs (seven thousand pounds).

Men are easily reconciled to paying the rent of a house or the price of a farm. But this good-will disappears when an idea is the subject treated of, whatever advantage, whatever profit, it may be the means of procuring. Ideas! are they not conceived without trouble or labor? Who can prove that with time the same might not have occurred to everybody? In this way days, months, and years of priority would give no force to the patent!

Such opinions, which I need not here criticize, had obtained a footing from mere routine as decided. Men of genius, the “manufacturers of ideas,” it seemed, were to remain strangers to material enjoyments; it was natural that their history should continue to resemble a legend of martyrs!

Whatever may be thought of these reflections, it is certain that the Cornwall miners paid the dues that were granted to the Soho engineers with increased repugnance from year to year. They availed themselves of the very earliest difficulties raised by plagiarists, to claim release from all obligation. The discussion was serious; it might compromise the social position of our associate: he therefore bestowed his entire attention to it and became a lawyer. The long and expensive lawsuits that resulted therefrom, but which they finally gained, would not deserve to be now exhumed; but having recently quoted Burke as one of the adversaries to our great mechanic, it appears only a just compensation here to mention that the Roys, Mylnes, Herschels, Delucs, Ramsdens, Robisons, Murdocks, Rennies, Cummings, Mores, Southerns, eagerly presented themselves before the magistrates to maintain the rights of persecuted genius. It may be also advisable to add, as a curious trait in the history of the human mind, that the lawyers — I shall here prudently remark that we treat only of the lawyers of a neighboring country — to whom malignity imputes a superabundant luxury in words, reproached Watt, against whom they had leagued in great numbers, for having invented nothing but ideas. This, I may remark in passing, brought upon them before the tribunal the following apostrophe from Mr. Rous: “Go, gentlemen, go and rub yourselves against those intangible combinations, as you are pleased to call Watt’s engines; against those pretended abstract ideas; they will crush you like gnats, they will hurl you up in the air out of sight!”

The persecutions which a warm-hearted man meets with, in the quarters where strict justice would lead him to expect unanimous testimonies of gratitude, seldom fail to discourage, and to sour his disposition. Nor did Watt’s good humor remain proof against such trials. Seven long years of lawsuits had excited in him such a sentiment of indignation, that it occasionally showed itself in severe expressions; thus, he wrote to one of his friends:

What I most detest in this world are plagiarists! The plagiarists. They have already cruelly assailed me; and if I had not an excellent memory, their impudent assertions would have ended by persuading me that I have made no improvement in steam-engines. The bad passions of those men to whom I have been most useful (would you believe it?) have gone so far as to lead them to maintain that those improvements, instead of deserving this denomination, have been highly prejudicial to public wealth.”

Watt, though greatly irritated, was not discouraged. His engines were not, in the first place, like Newcomen’s, mere pumps, mere draining-pumps. In a few years he transformed them into universal motive powers, and of indefinite force. His first step in this line was the invention of a double-acting engine (à double effet).

In the engine known under this name, as well as in the one denominated the “modified” engine, the steam from the boiler, when the mechanic wishes it, goes freely above the piston and presses it down without meeting any obstacle; because at that same moment, the lower area of the cylinder is in communication with the condenser. This movement once achieved, and a certain cock having been opened, the steam from the caldron can enter only below the piston and elevates it. The steam above it, which had produced the descending movement, then goes to regain its fluid state in the condenser, with which it has become, in its turn, in free communication. The contrary arrangement of the cocks replaces all things in their primitive state, as soon as the piston has regained its maximum height. Thus, similar effects are reproduced indefinitely.

To Be Continued.

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