Specification of Moses Poole : tubular steam boilers.

  • Poole, Moses.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Moses Poole : tubular steam boilers. Source: Wellcome Collection.

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    Pooles Improvements in the Apparatus for Raising or Generating Steam, <$c. NOW KNOW YE, that in compliance with the said proviso, I, the said Moses Poole, do declare the nature of the said Invention is described as follows (that is to say):— The improvement in the apparatus for raising or generating steam, which I shall first describe, consists in the mode of forming the boiler, which is composed 5 of a series of tubes (5, 5, 5,) connected at their ends in such manner that they shall form one continued channel or passage through the whole, as shewn by the arrows (Figure 3). At one end of the series, the feed pipe (a) from the pump is attached, and to the other a strong vessel (Q, Figure 3), which receives the steam from the boiler when it is formed, as the water is driven through the 10 boiler from the feed pipe. In this vessel any water that may have passed unconverted into steam in its passage, is separated by its own gravity, and is again driven through the boiler by means of a force pump (R) provided for the purpose; in some cases the water may be allowed to pass with the steam from this vessel through the engines, which are peculiarly formed for the purpose, as 15 will be presently shewn, to the second vessel (M), where it seperates by its own gravity, as in the first case, and from which it is also recirculated through the boiler by the pump provided for the purpose. The steam is taken from the top of the first vessel or separater (Q), and carried by a pipe (w) to its required situation. The pipes or tubes forming the boiler are joined by screwing each 20 into a hollow casting (r, Figure 2 and 3); the joint is made good by bringing back a collar before a nut packed with asbestos or fire lute. The pipes may be of any length or size proportioned to the power required; those shewn in the Drawing are about three feet six inches long, and about one inch bore; they are place parrelled to each other over the fire, down the sides, and under the 25 fire, thus forming a sort of cage work, in which the fuel is placed. In the end of the castings a bolt (t) is screwed opposite the end of every pipe, so that at any time it may be withdrawn and the pipes cleaned. This may be done by forcing a rod up and down the pipes, armed with a barb at its end, like the rods used to clean gun-barrels, or any other simple mode; when the 30 incrustation is thus mechanically removed from the sides of the tubes, they are washed out by pumping water through them. This being done, the bolt is % again screwed into its place, packed under the head or not, as circumstances require. As the quantity of water in the tubes is very small compared with the heating surface exposed, and there is no circulation or supply except by the 35 force pumps which are worked by the engines, it is necessary that some means should be used when the engine stops to keep up the supply and circulation, otherwise the pipes will soon become red hot, and do considerable mischief. This may be done by hand or by a small cylinder provided expressly for the