US Patent: 6,623X
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Steam Boiler
Safety Steam Boiler
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Patentee:
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| John C. Douglas (exact or similar names) - New York, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jul. 20, 1831 |
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Joel Havens
X-Patents
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Description: |
| Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
“For an improvement in the mode of making Steam Engine Boilers, called the safety steam boiler; John C. Douglass, city of New York, July 20.
We gave at p. 226, vol. vii. the specification of a patent for a steam engine boiler, which issued to the same gentleman on the 17th day of December, 1830. The present boiler is constructed under the same theoretical views with his former; views which are at variance with all the well-established principles of natural philosophy, and which therefore have led the patentee wide of the goal at which it was his hope to arrive.
We are told that the improvement now offered is founded on the discovery, that very many, if not all, the explosions of steam boilers arise from the fact that a highly rarified state of steam, or a vacuum, exists within the boiler, at the bottom and lower parts of the boiler." The mode in which this vacuum is supposed to be formed is the removal of pressure in the boiler by the opening of the safety valve, or from any other cause. The steam and foam then ascending to the top, leaving a void space below, the consequence of which will be a collapse of the boiler.
In order to fill up this vacuous space, tubes are to lead into the lower part of the boiler, and to be bent up at the outside to the height at which the water in the boiler is intended to stand. The upper ends of these tubes are to be furnished with valves, which open in. wards, so that when there is a vacuum formed in the boiler, the valves may open, and admit either air, or water, as may be desired.
This certainly is the most powerful, and at the same time the most capricious vacuum of which we have ever heard; for whilst it sustains the whole load of water, and the pressure of steam in the boiler, it refuses to keep a valve closed which opens inwards to supply the boiler with air or water.
We perceive but little difference in the assumption and principle, or rather absence of principle, upon which the two patents taken out by this gentleman are founded.”
Journal of the Franklin Institute, Vol. 9, Jan. 1832 pgs. 40-41
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