Specification of Joseph Knowles Broadbent : preventing smoke from furnaces.

  • Broadbent, Joseph Knowles.
Date:
1867
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Joseph Knowles Broadbent : preventing smoke from furnaces. Source: Wellcome Collection.

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    JBroadbent’s Improvements in Machinery for Preventing SmoJce from Furnaces. Knowles Broadbent, my executors, administrators, and assigns, or such others as I, the said Joseph Knowles Broadbent, my executors, administrators, and assigns, should at any time agree with, and no others, from time to time and at all times thereafter during the term therein expressed, should and 5 lawfully might make, use, exercise, and vend, within the United Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for “ Improvements in Machinery or Apparatus for the Prevention of Smoke from Furnaces used for Steam Boilers and other similar Purposes,” upon the condition (amongst others) that I, the said Joseph Knowles Broadbent, 10 my executors or administrators, by an instrument in writing under my, or their, or one of their hands and seals, should particularly describe and ascertain the nature of the said Invention, and in what manner the same was to be performed, and cause the same to be filed in the Great Seal Patent Office within six calendar months next and immediately after the 15 date of the said Letters Patent. NOW KNOW YE, that I, the said Joseph Knowles Broadbent, do hereby declare the nature of my said Invention, and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement (that is to say) :— 20 This Invention consists of a peculiar combination and arrangement of improved machinery or apparatus for admitting a constantly graduated supply of atmospheric air to the flues of the furnaces of steam boilers and other similar furnaces in order to suit the varying requirements of the fuel and the increasing and diminishing supply of the gases generated therefrom, and 25 limiting that supply to the smallest quantity required for the purpose of perfect combustion, and thus prevent the formation of smoke and realize economy in fuel. Behind the ordinary bridge there is a second bridge, the space between the two forming the combustion chamber, and in the ordinary bridge below the fire-bars I build or fix an air box having an aperture fitted 50 with a valve working on centres or pivots. To the valve is fixed an arm or crank jointed to a rod which extends to the front of the boiler, and is jointed at that end to a lever attached by a link to a lever connected with a meter for turning the valve in one direction, and on the furnace door there is an arm or lever for acting on the levers, winding up the meter, and turning the valve in 55 the opposite direction. When the furnace is being closed the valve is turned to the full extent in one direction, and is then open to about one-third of its area, at the same time the meter commences to turn the valve in the opposite direction, and when the valve has travelled about one-third of its course it will be open to the full extent, when it will take about double the time to