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The French troops had reached the first houses of the village of Curlu occupied by Bavarian troops, who offered a most stubborn resistance. Machine guns and mitrailleuses, which the French bombardment had not destroyed, appeared suddenly on the roofs of houses, in the ventholes of the cellars, and in every available opening.
After I had made its coat of earth, covered it well, and bound it properly with irons, I began by means of a slow fire to draw off the wax, which melted away by many ventholes; for the more of these are made, the better the molds are filled; and when I had entirely stript off the wax, I made a sort of fence around my Perseus, that is, round the mold above mentioned, of bricks, piling them one upon another, and leaving several vacuities for the fire to exhale at.
In this vessel are valves, accurately fitting over the upper vents of the pipes, which stop up the ventholes, and keep what has been forced by pressure into the vessel from going down again.
Inside the altar, which holds the water, is a regulator shaped like an inverted funnel, under which there are cubes, each about three digits high, keeping a free space below between the lips of the regulator and the bottom of the altar. Each of the channels has a cock in it, furnished with an iron handle. These handles, when turned, open ventholes from the windchest into the channels.
From the cylinders there are connecting pipes attached to the neck of the regulator, and directed towards the ventholes in the windchest. When the windchest has received the air, these valves will stop up the openings, and prevent the wind from coming back again.
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