US120894A - Improvement in agricultural boilers - Google Patents

Description

JOHN MURDOOK, OF SOUTH CARVER, MASSACHUSETTS.

IMPROVEMENT IN AGRICULTURAL BOILERS.

Specication forming part of Letters Patent No. 120,894, dated November 14, 1871.

To all whom 'it may concern:

Be it known that I, JOHN MURDocK, of South Carver, in the coimty of Plymouth and State of Massachusetts, have invented a new and useful Improvement in Farm Boiler-Furnace; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification.

My improvement in boiler-furnaces consists `in combining therewith a damper for direct draught, wherein the heat is carried completely around the kettle in one united flue. The advantage of my improvement is, that the damper is enabled to give a much larger opening than can be produced on my former invention, where the upper portion of the kettle becomes heated, while opening directly' into the smoke-pipe and closing the iiue around the kettle, all circulation is effectually arrested.

ln the accompanying drawing, Figure 1 is a vertical section of the furnace and boiler taken on the line :v m of Fig. 2. Fig. 2 is a vertical section of Fig. 1 taken on the line y y.

Similar letters of reference indicate corresponding parts.

A is the furnace, which does not differ (except in the matter hereinafter speciiied) from a farmboiler furnace now in use and well known to the public. B is the boiler. C is the iire-iiue. D is a horizontal iiange projecting inward on the furnace, the inner edge of which the lower portion of the boiler iits, as seen in Fig. 1. As the furnaces have heretofore been made, this iiange is broken away on one side a suflicient space to allow the smoke and heat to ascend and surround the upper portion ofthe boiler, the broken space being directly beneath the exit-nue. E is a continuation of the iiange D, terminating in contact with the inwardly-projecting iiange F, around the rim or top of the furnace. It will be seen that iiange E covers the opening in the iiange D. The products of combustion are thereby conducted through the opening around the boiler and upward into the discharge-flue, the discharge-orifice being directly above the part E. Now my improvement consists in making a discharge-orifice, J, below the part E, and arranging in the discharge-flue G a sliding damper, H, by means of which either the upper orv the lower orifice may be closed while the other remains open.

By this arrangement a direct draught is given to the furnace in starting a fire. The heat may be regulated as may be required by the contents of the boiler, as damage is frequently caused by allowing the full heat of the furnace to pass up around the boiler when the boiling is nearly or quite completed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- In a boiler-furnace, A B O D, the flange E having one outlet above and another below it into the discharge-iiue G, combined with a sliding damper, H, as and for the purpose specified.

The above specification of my invention signed by me this 3d day of March, 1871.

JOHN MU'BDOCK.

fr. B. Mosnnn. (59)

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