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The mould is then placed in the bath, containing a solution of sulphate of copper, and is made a part of an electric circuit, in which is also included the zinc element in the sulphuric-acid solution in the other bath.
Whatever had remained of the town of Gorlice in the shape of buildings or human beings was meanwhile being wiped out by a merciless spray of shells. Being the center or an important oil district, Gorlice possessed oil wells, great refineries, and a sulphuric-acid factory.
Clark had had the excellent idea of attaching a gold-beater's-skin balloon, with a lifting power of 35 pounds, to each sledge, and we had with us a supply of zinc and sulphuric-acid to repair the hydrogen-waste from the bags; but on the third day Mew over-filled and burst his balloon, and I and Clark had to cut ours loose in order to equalise weights, for we could neither leave him behind, turn back to the ship, nor mend the bag.
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