Model of a Double Pair of Hydraulic Forge Bellows, Rijkswerf Rotterdam, 1818 Canvas Print
Model of a double hydraulic bellows on the ground shelf. It consists of two vessels and a drive mechanism, which is incomplete. Each barrel has a cylinder inside that connects top and bottom; the space inside is therefore an endless circle, which is however made finite by a bulkhead placed in the longitudinal direction between the outer and inner wall. On one side there is an inbound valve with chamois leather valve on both sides of this bulkhead, on the other side outgoing valves to which a ventilation pipe is connected. The vessels are suspended horizontally in two forks and are rotated back and forth around their axis by means of the drive mechanism a quarter circle; they each have a quadrant and a system of rollers and ratchets, for which rope or chain must be led. Of the drive mechanism, only the frames and a bunch of gear wheels are left. If the vessels are half filled with water, the space left for air is divided into two compartments: by turning the vessel back and forth, they alternately become larger and smaller, because the water surface remains horizontal. This is how the air flow is created. The ventilation pipes are bent so that their ends are equal to the rotation axes of the vessels and each connect to a fixed pipe; the two fixed pipes come together where they are guided through a back wall.
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