"The salt water is obtained by sinking a tight curb, or gum, at the edge of the river, down about twenty feet, to the rock which underlies the river, and then boring into the rock. At first the borings did not exceed 200 feet in depth, but the upper strata of water being exhausted, the wells were gradually deepened, the water of the lower strata being generally stronger than the upper had ever been. Until 1842, none of the wells exceeded 6 or 700 feet in depth. Mr. Tompkins, an enterprising salt-maker, was the first to extend his borings to a thousand feet, or more. His experiment was attended with a most unexpected result. He had somewhat exceeded a thousand feet, when he struck a crevice in the rock, and forth gushed a powerful stream of mingled gas and salt water. Generally, the salt water in the wells was obtained in rock merely porous, and rose by hydrostatic pressure to the level of the river. To obtain the strong water of the lower strata, unmixed with the weak water above, it is the practice to insert a copper tube into the hole, making it fit tightly below by means of wrapping on the outside, and attaching the upper end to the pump, by which the water is drawn up to the furnaces on the river bank.
"When Mr. Tompkins inserted his tube, the water gushed out so forcibly, that instead of applying the pump, he only lengthened his tube above the well. The stream followed it with undiminished velocity to his water cistern, 60 feet above the level of the river.
"In the next place, he inserted the end of the spout from which the water and gas flowed, into a large hogshead, making a hole in the bottom to let out the water into the cistern. Thus the light gas was caught in the upper part of the hogshead, and thence conducted by pipes to the furnace, where it mingled with the blaze of the coal fire. It so increased the heat as to make very little coal necessary; and if the furnace were adapted to the economical use of this gaseous fuel, it would evaporate all the water of the well, though the quantity is sufficient to make five hundred bushels of salt per day. The same gentleman has since obtained a second gas-well near the former, and in all respects similar to it. Other proprietors of wells have also struck gas-fountains by deep boring. In one of these wells the gas forces the water up violently, but by fits, the gush continuing for some two or three hours, and then ceasing for about the same length of time. In another of these wells there has been very recently struck, a gas-fountain that acts with such prodigious violence as to make the tubing of the well in the usual way impossible; when the copper tube was forced down through the rushing stream of brine and gas, it was immediately flattened by the pressure; and the auger-hole must be enlarged to admit a tube sufficiently strong and capacious to give vent to the stream without being crushed. In another well, a mile and a half from any gas-well, a powerful stream of gas has been recently struck. It forces up the water with great power; but, unfortunately for the proprietor, the water is too weak to be profitably worked. It appears from this fact, that the gas is not inseparably connected with strong brine. When struck before good salt water is reached, it will operate injuriously, for no water obtained below it can rise at all, unless the pressure of the gas be taken off by means of a strong tube extending below it.