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Updated: May 7, 2025
This latter enters under the partition, l'm, of one of the buckets, and exerts an upward thrust upon it that communicates a rotary motion to the drum. The bucket, l'mi, closed hydraulically, rises and fills with gas until the following one comes to occupy its place above the entrance tube and fills with gas in turn.
The whole right-hand side of the wall was sinking without a sound into the floor, increasing the width of the room by some five or six feet and in this space was disclosed what appeared to be a sort of chemical laboratory, elaborately equipped, extending the entire length of the room. "The wall is purely a matter of mechanical construction, operated hydraulically."
A hydraulic ramrod thereupon wets his whistle with a sponge, on the end of which is a small reservoir of water. The monster is temperate. This withdrawn, a wad is placed on the end of the ramrod. Three men shove a bolster of powder into the gun's mouth. The huge shot is then hydraulically lifted to the muzzle.
Here the cylinders are sunk, while being guided, through wrought-iron pontoons, which are floated to their berths, and are then secured at the desired spot by the protrusion, hydraulically, of four legs, which bear upon the bottom, and thus, until they are withdrawn, convert the pontoon from a floating into a fixed structure.
Gatun dam fills the opening between the hills at Gatun through which the Chagres river flows to the Caribbean Sea. It consists, if it may be regarded in the light of a finished production, of a water-tight center or core composed of sand and clay mixed in proper proportion and deposited hydraulically; that is by being pumped in. On each side a wall of rock confines this core.
Portland cement concrete if made with a non-porous aggregate is impervious to moisture, and yet at the same time, if not hydraulically compressed, will take up a sufficient quantity of moisture from the air to prevent condensation upon the surface of the walls. It not only resists the disintegrating influences of the atmosphere, but becomes even harder with the lapse of time.
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