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PART III. 



MISCELLANEOUS INTELLIGENCE. 



Art. I. General Notices. 



Witty's improved Furnace, (p. 225.) — The inventor has sent us the 

 following extract from the specification of his patent, together with a 

 section and description of his furnace. 



Extract from the Specification. "It will be seen from this arrangement 

 of my apparatus, that fresh coal is first carbonised, that is, the gas is 

 separated from it and inflamed, leaving only coke, which, being slowly 

 pushed forward, supplies the coke fire ; and the combustion or burning of 

 the coke produces heat enough to carbonise the coal, and air enough to 

 inflame the gas : consequently, coal, instead of being burned in its usual 

 crude state, is subjected to two distinct processes, viz. carbonisation, and 

 then combustion ; for by my contrivance I burn the gas and the coke 

 together." 



1 I X 



Description of the Section, a. The hopper, where slack is put in at the 

 door b. d. An oblong square box the width of the furnace, fitted with a 

 screw and cross bw, by which the pusher or presser, c c, is moved back- 

 wards and forwards at pleasure, in order to let the coals down from the 

 hopper, or advance them forward down the inclined plane,//, which is 

 made of fine tile supported by crossbearing bars, g g g. h. The grate 

 swinging on its centre, ?, which may be placed at the most convenient 

 angle, and supported by a chock brick placed in the opening at n, which 

 opening serves to get out the ashes and clinkers when required. 1-, The 

 ashpit. /, Steps down to the ashpit. 



