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I should cut a fine figure, metaphorically, if not arithmetically speaking; whereas my farthing rush-light is now sputtering, clinkering, and guttering to waste, and all because I have not a pair of silver snuffers. If you wish me to move the world, produce your lever! Your wealthy bard has at least audience; and if he cannot sing, he may thank his own hoarse throat, and not the Destinies.
The combustion of a vastly increased bulk of pulverized coal and a greatly enlarged combustion zone, extending about forty feet longitudinally into the kiln thus providing an area within which the material might be maintained in a clinkering temperature for a sufficiently long period to insure its being thoroughly clinkered from periphery to centre. Third.
The comparatively short length of the sixty-foot kiln not only limited the amount of material that could be fed into it, but the limitation in length of the combustion zone militated against a thorough clinkering of the material, this operation being one in which the elements of time and proper heat are prime considerations. Thus the quantity of good clinker obtainable was unfavorably affected.
In all rotary kilns for burning cement, the true clinkering operation takes place only within a limited portion of their total length, where the heat is greatest; hence the interior of the kiln may be considered as being divided longitudinally into two parts or zones namely, the combustion, or clinkering, zone, and the zone of oncoming raw material.
Consequently, beyond that point there was a zone of only about forty feet, through which the heated gases passed and came in contact with the oncoming material, which was in movement down toward the clinkering zone.