 | Perry Fairfax Nursey - Industrial arts - 1850 - 550 pages
...perpendicularly, an air-tight cap is fixed to the upper end. This cap communicates with a powerful air-pnmp, by means of which the air is exhausted from the tube,...the water which rises during their action, and the exhaustion process is then continned. The upper end of the tube having become level with the surface,... | |
 | Industrial arts - 1850 - 554 pages
...joints, and one of them being placed perpendicularly, an air-tight cap is fixed to the upper end. This cap communicates with a powerful air-pump, by means...or shingle with the •water which ascends, and the tnbe immediately descends from the effects of outward atmospheric pressure. The contents of the tube... | |
 | Engineering - 1873 - 1082 pages
...joints, and one of them being placed perpendicularly, an air-tight cap is fixed to the upper end. This cap communicates with a powerful air-pump, by means...the tube immediately descends from the effects of ontwnrd atmospheric pressure. The contents of the tube are then removed by the pump, which readily... | |
 | Lighthouses - 1879 - 284 pages
...better than shutiing up a telescope. The method of operation is this : — One of the tubes beinu! placed perpendicularly, an air.tight cap is fixed...from the effects of outward atmospheric pressure. The practicability of the scheme being proved, several Beacons, as before stated, were erected as on the... | |
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The cap communicates with a powerful air-pump, by means of which the air is exhausted from the tube, drawing up the sand or shingle with the water which ascends, and the tube immediately descends from the effects of outward atmospheric pressure. The contents... 