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Full text of "APPARATUS FOR EXTINGUISHING SPARKS - United States Patent 688"

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Specification of Letters Patent No. 688, dated April 13, 1838.

To all whom it may concern:

Be it known that I, William T. James, of the city, county, and 
State of New York, and a citizen of the State of New York and of 
the United States, have invented and brought into use a new and 
useful improvement in the method of preventing the sparks or 
ignited particles of fuel issuing from the tops of chimnies or 
smoke-pipes from escaping into the atmosphere with the smoke and 
gases which proceed from furnaces or fires. This improvement is 
applicable chimnies and to smoke-pipes of furnaces or fires used 
to generate steam to work steam-engines and other purposes; but 
is of the most value when applied to the smoke-pipes used on 
steam-boats and low-motive engines on rail roads; where the 
sparks of ignited fuel which escape from the smoke-pipes, are 
always inconvenient and often dangerous.

The description of my improvement is as follows: The chimney or 
smoke-pipe is surrounded by another pipe or funnel, three and a 
half times its diameter at the top, and made smaller at the 
bottom, just so as to fit the smoke-pipe; and in length about 
five times the diameter of the smoke-pipe, its shape somewhat 
resembling that of a speaking-trumpet—only the mouth or upper end 
has a concave flanch on it as wide as the diameter of the 
smoke-pipe projecting inward and downward on an angle, so as to 
leave the mouth only twice as large as the diameter of the 
smoke-pipe, the top of which is in the center below the mouth or 
opening left by the flanch, and is covered by a circular piece of 
sheet-iron rendered concave or conical, the convex or conical 
side down—the apex of the cone or the center of the convexity 
being placed in the center of the smoke-pipe; and the diameter of 
this piece or covering being double that of the top of the 
smoke-pipe and just the size of the opening left by the flanch 
above; and at the distance below the flanch or mouth, of about 
one half of the diameter of the smoke-pipe. Around this inverted 
conical piece and on the under side are placed or fastened six 
spiral flues or issues which enter the smoke-pipe at equal 
distances on its circumference and exactly at the top the six 
combined being at least equal in magnitude to the smoke-pipe so 
as not to obstruct or check the draft; the form of these openings 
may be that of an oblong square and on the under side they may be 
left open their entire length.

The drawings which accompany this specification and make part of 
it will show the parts more distinctly.

The smoke, gases and sparks when they ascend the chimney or 
smoke-pipe escape through these spiral openings or flues and take 
a circular direction under the flanch; and the sparks being of 
greater specific gravity than the smoke, their centrifugal force 
impels them through the smoke against the inner side of the outer 
tube which surrounds the smoke-pipe, where they circulate until 
they drop to the bottom of the tube, and thus their escape from 
the top of the smoke-pipe into the open air is prevented. There 
is a hole at the bottom of the tube which surrounds the 
smoke-pipe covered by a slide for the purpose of removing the 
extinguished cinders, if necessary, and opposite to this there 
are holes in the smoke-pipe into which the cinders may pass when 
accumulated in quantity; and it has been contemplated to place 
tubes to these holes through which the cinders might descend to a 
part of the fire place out of the strength of the draft; or by 
placing a descending tube at the first mentioned hole they may be 
conveyed to any other convenient place. The outer tube or pipe 
may be of the same shape as the smoke-pipe; but the above is the 
most convenient form though not essential. The openings or flues 
above described should be so large and numerous as not in any 
measure to obstruct or check the draft of the smoke-pipe. This 
improvement is applicable to all chimnies and smoke-pipes from 
which ignited particles of fuel or sparks may issue; and consists 
in the application of the above outer tube—the flanch—the conical 
cover and the spiral flues in combination and in their 
application to the aforesaid object. I do not claim said outer 
tube—or the flanch or the flues or any other part of said machine 
or machinery separately nor any of the combination separately and 
independently of the object aforesaid; but

I claim as my invention and improvement—

The combination of the outer tube—the flanch—the conical 
cover—the openings and spiral flues in their combination with a 
smoke-pipe or chimney for the purposes aforesaid in manner 
aforesaid or any other manner substantially the same.

In testimony whereof, I the said William T. James hereunto 
subscribe my name in the presence of the witnesses whose names 
are hereto subscribed, on the sixth day of December, A. D. 1837.


Witnesses: Saml. Fairlamb, Samuel Fey.