The forge which Gilliatt intended was roughly sketched out by nature; but nothing could be more troublesome than to reduce this rough sketch to manageable shape, to transform this cavern into a laboratory and smith’s shop. With three or four large rocks, shaped like a funnel, and ending in a narrow fissure, chance had constructed there a species of vast ill-shapen blower, of very different power to those huge old forge bellows of fourteen feet long, which poured out at every breath ninety-eight thousand inches of air. This was quite a different sort of construction. The proportions of the hurricane cannot be definitely measured.
This excess of force was an embarrassment. The incessant draught was difficult to regulate.
The cavern had two inconveniences; the wind traversed it from end to end; so did the water.
This was not the water of the sea, but a continual little trickling stream, more like a spring than a torrent.
The foam, cast incessantly by the surf upon the rocks and sometimes more than a hundred feet in the air, had filled with sea water a natural cave situated among the high rocks overlooking the excavation. The overflowings of this reservoir caused, a little behind the escarpment, a fall of water of about an inch in breadth, and descending four or five fathoms. An occasional contribution from the rains also helped to fill the reservoir. From time to time a passing cloud dropped a shower into the rocky basin, always overflowing. The water was brackish, and unfit to drink, but clear. This rill of water fell in graceful drops from the extremities of the long marine grasses, as from the ends of a length of hair.
He was struck with the idea of making this water serve to regulate the draught in the cave. By the means of a funnel made of planks roughly and hastily put together to form two or three pipes, one of which was fitted with a valve, and of a large tub arranged as a lower reservoir, without checks or counterweight, and completed solely by air-tight stuffing above and air-holes below, Gilliatt, who, as we have already said, was handy at the forge and at the mechanic’s bench, succeeded in constructing, instead of the forge-bellows, which he did not possess, an apparatus less perfect than what is known now-a-days by the name of a “cagniardelle,” but less rude than what the people of the Pyrenees anciently called a “trompe.”
He had some rye-meal, and he manufactured with it some paste. He had also some white rope, which picked out into tow. With this paste and tow, and some bits of wood, he stopped all the crevices of the rock, leaving only a little air passage made of a powder-flask which he had found aboard the Durande, and which had served for loading the signal gun. This powder-flask was directed horizontally to a large stone, which Gilliatt made the hearth of the forge. A stopper made of a piece of tow served to close it in case of need.
After this, he heaped up the wood and coal upon the hearth, struck his steel against the bare rock, caught a spark upon a handful of loose tow, and having ignited it, soon lighted his forge fire.
He tried the blower: it worked well.
Gilliatt felt the pride of a Cyclops: he was the master of air, water, and fire. Master of the air; for he had given a kind of lungs to the wind, and changed the rude draught into a useful blower. Master of water, for he had converted the little cascade into a “trompe.” Master of fire, for out of this moist rock he had struck a flame.