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gasometer
When it needs to collect a very remarkable volume of gas is undertaken by the gasometer which is composed of a cylindrical vase A brass, topped by a tray C, supported by five columns of brass. Two of these, and b, are hollow and provided with keys. The tube ends immediately in the vessel A, just across the upper wall of him, instead the pipe b descends to near the bottom. In a small c starts to stick equipped with bedding, and d in a curved tube, short and wider which can be closed with a cork.
You start by filling water this apparatus. To this end, being closed the key c and the tube, they open the taps b and pours water into the basin C. The water passes into the vessel A for the long tube b, and the air of the vessel escapes through the tube; continues to pour water into the vessel C until A it is not full. Then close the keys a and b.
To fill the gasometer of a gas, opens the tube; the water does not come out as oppose atmospheric pressure. D is introduced in the pipe carrying gas, so that it penetrates into the vessel A. The gas goes to collect in the upper part of the vessel A and the displaced water streams from the tube in a basin below.
The glass tube gh serves as the level of the accumulated gas. When there is only a little water in the cylinder, it keeps the tube carrying and closes d.
Later you can save gas all the time you want.
If you open the only key b, a part of the water contained in the upper tank streaming into the vessel A; quest'efflusso continues as long as the gas, compressed in a smaller space, has purchased a resilient force equal to the atmospheric pressure, which acts on the water level in the tub happens, increased by the pressure produced by the water column between the level water in the pool and the water level in the vessel A.
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