Specification of John Wright : furnaces for steam boilers.

  • Wright, John.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Wright : furnaces for steam boilers. Source: Wellcome Collection.

    4/8 (page 2)
    Wright's Improvements in Raising Steam for Working Fire Engines. date thereof; in which said Letters Patent is contained a provisoe, that if the said John Wright should not particularly describe and ascertain the nature of the said Invention and in what manner the same is to be performed, by an instru¬ ment in writing under his hand and seal, and cause the same to be in rolled in the High Court of Chancery within four kalendar months next after the date 5 of the said Letters Patent, that then the said Letters Patent and all advantages thereby granted should cease and become void. NOW KNOW YE, that the said John Wright, in pursuance and perform- . * • ' ance of the said provisoe, doth hereby describe and ascertain the nature of the said Invention, and in what manner the same is to be performed, as follows 10 (that is to say):— The boiler is made of copper or iron plates hammered and rivetted together in the ordinary way and form of boilers now in use for atmosphere engines worked by steam of boiling water, but with the following difference, (viz*,) this boiler is heated with fire made to reverberate by the bottom of the boiler 15 being of a shape to form the arch or roof and inner side walls of a reverberating furnace, and is placed over a hollow or open space of about ten feet long from the bridge to the reverberatory, and eight feet wide in the middle or widest part; five feet wide at the bridge, and six feet wide at the reverberatory, as in the plan annexed, Figure 1. The bottom of the boiler is made sloping, and fixed 20 three feet high at the bridge and one foot high at the reverberatory above the bottom of the hollow or open space through which the flame and hot air pass from the fire-place or grate under the bottom of the boiler to the reverberatory, as in Figures 2 & 5, 5, b. The flame and hot air are returned under a flanch or elbow that projects from the outside of the boiler about one foot, and forms a 25 cavity between the brickwork and the outside of the boiler of about fourteen inches by twelve, as in Figures 3, 4, & 5, c, c, through which cavity they pass into the chimney or stack, as in Figure 2, d. The hollow or open space is divided into two flews or cavitys, as in Figures 1 ,&5,b,b, which are twelve inches by nine each, and are contained of the same dimensions, one foot and a half upright, and 30 are there returned under the flanch or elbow before described. The bottom of the boiler is made to descend in two trows or hollows, one on each side the before- mentioned hollow or open space, of about one foot wide and ten feet long each, as in Figure 1, a, a. These trows or hollows are made curving, so as to form the two sides of the said hollow or open space, and communicate with the 35 feet by two feet, and is divided from the said hollow or open space by a bridge of about one foot six inches high and two foot six inches wide at the bottom, and brought tapering up on each side to about one foot wide at the top, over which bridge the flame passes under the bottom of the boiler, as in Figure 2, e. 40 ..