Specification of John Theodore Paul : tubular steam boiler.

  • Paul, John Theodore.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Theodore Paul : tubular steam boiler. Source: Wellcome Collection.

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    Paul's Improvements in Generating Steam for Various Purposes. NOW KNOW YE, that in compliance with the said proviso, I, the said John Theodore Paul, do hereby declare that the nature of the said Invention, and the manner in which the same is to be performed, are particularly described and ascertained in and by the Drawing hereunto annexed, and the following description thereof (that is to say) :— . o The said Invention, for which a French Brevet de Invention for fifteen years, has been granted to Messrs Revon and Moulinie, of Paris, in December One thousand eight hundred and twenty-three, consists of a method of converting water into high pressure steam, by exposing it to the action of heat in a long continuous metal pipe of a small diameter; and into one end of which pipe the 10 water being forced or injected will pass out at the other end of it in the state of high pressure steam. The length of the pipe forming this boiler, whatever may be its diameter, ought to be such, that being heated throughout its whole length to a heat below redness, the water that is, as before-mentioned, forced into it at one end of it shall pass out at the other end in a state of steam of 15 such elastic force as shall be sufficient for the work it is to perform ; a pipe calculated to supply an engine of the power of two horses should be at least one hundred and fifty feet long. The diameter of the pipe, whatever may be ■ its length, ought to be as small as possible, provided that the quantity of steam generated within it in a certain time be sufficient to perform the work 20 required. A copper pipe to supply an engine of the above power should be at least three-sixteenths of an inch in its internal diameter, and one-sixteenth of an inch in thickness. In the annexed Drawing, Figs 1 and 2 repre¬ sent two pipe boilers constructed upon the before-mentioned principles, each of them being calculated to produce sufficient steam for working an engine of 25 the power of two horses under the pressure of one hundred and fifty pounds upon the square inch. Fig. 1 is the section of a boiler, &c.; A, B, C, D, E, F, G, H, I, J, is a single continuous pipe coiled in a circular manner in the form represented ; K, K, an external casing formed of sheet iron or other fit and proper material or materials ; this is intended to prevent the escape of 30 the heat, and to support the coil of pipe upon the flange L, L; that part of the coiled pipe which is marked H, F, G, I, is so constructed as to operate as a grate to support the fuel; M, M, the fuel which is thrown into the fire¬ place, either at the chimney N, when it is only of a moderate length, or at a door; 0, 0, a circular reservoir to contain waiter for supplying the injecting 35 pump; P, P, brick dust or coal ashes; Q, the forcing or injecting pump; R, R, the valve box and valves; S, a flange at the end of the coiled pipe out of which the steam rushes, under a high pressure. The fire being lighted and the pipe sufficiently heated, the pump must be worked; the water will then be