In the bluff at Dubuque, lead mining was carried on in two ways—first, by entering the caverns and veins from the foot of the bluff; and, secondly, by sinking shafts from the surface. The shafts were not very deep, so that no elaborate machinery was required for hoisting purposes, a common windlass or a whim, worked by horse power, being all that was required. Where the mining was pushed from the foot of the bluff, levels were driven in until a cavern or seam was reached, and very often the seams in the bluff were taken as the starting-point. The lead was not found in continuous veins, like coal and iron, but in separate masses, that had little connection with each other, though frequently the chambers or caves communicated. Consequently a mine might be soon exhausted, and then the shaft or level would be abandoned, as it was no longer lucrative. The hills back of Dubuque, at the time of my visit, were full of abandoned shafts, and it was dangerous to walk there at night, as many of the shafts were entirely unprotected by fences or railings. Several accidents have occurred by persons falling into these shafts; and I was told that on one occasion two lovers, who were taking an afternoon promenade there, walked into a shaft, and were killed by the fall.
While the business of Dubuque was in the height of its prosperity, about 1857, some enterprising men constructed a shot tower on the low ground near the Mississippi River. It is well known that shot for ordinary hunting purposes is made by pouring melted lead through a sieve, where it can have a fall of a hundred feet or more. In falling it assumes a spherical shape, and at the same time is cooled and hardened. To save it from injury it is received in a tank of water. Afterwards it is polished and brightened by being rolled in plumbago and certain other substances, and is then ready for the bags in which it is offered for sale in the sporting stores.
AN EDITOR’S DISCOVERY.
Now, the shot tower costs considerable money, and in order to be profitable, the work of making shot must pay the interest of the cost of the tower, besides the wages of everybody concerned. The editor of a newspaper at Dubuque was one day rambling among the abandoned shafts back of the town, and endeavoring to hit upon some plan for making them once more useful.
Suddenly an idea occurred to him, and he hastened to lay it before a friend who was interested in the shot tower.
A SURPRISING DISCOVERY.
“Here is my idea,” said the editor. “The melted lead must fall from a certain height, and you have spent fifteen thousand dollars to build a tower to give that height to the dropping lead. Now, it makes no difference where the fall is; and why could you not get it in one of these abandoned shafts, which would cost nothing? And besides, you save the expense of hoisting the lead to the top of the tower. I can start a shot company that will undersell you in spite of all you could do.”
The tower man stood a full minute in a brown study. When he had collected his thoughts, he said,—
“I think you are right, and wonder nobody ever thought of it before. But don’t say a word about it for the present. The St. Louis Shot Company is now negotiating for our tower; it wants to have a monopoly of all the shot business on the river, and we shall sell out. When we have sold out, and have the money in our hands, you can start your theory, and anybody that wants to try it can do so. If you say anything now, you may spoil the whole arrangement.”
The editor promised to wait, and kept his promise. The Dubuque tower was bought by the St. Louis Company, which congratulated itself on having a monopoly of the shot business at Dubuque. But very soon the editor advanced his theory; somebody put it in practice, and found it was entirely correct. Abandoned shafts were occupied by shot-makers, and found to answer the purpose exactly, and the business of the tower came to an end. “Why did not somebody think of this before?” is a question that is often asked whenever a new and simple invention is brought to the attention of the public.