Trippel.] "|9 [February. 



fore its practical application, I wish to state that, although this in- 

 vention is not new, and has been in actual use for twenty-five 

 years, it is now for the first time brought into a systematical form, 

 based upon scientific principles and facts shown by experience ; 

 and Mr. Schinz has certainly the incontestable merit of being the 

 author of this system. 



A question of the greatest importance for industry, — the rational 

 use of fuel, — discussed in so many ways in a scientific and practical 

 view, to which a great number of improvements and inventions are 

 attached, has, nevertheless, been solved so far in a very imperfect 

 and irrational way; and good results were more accidental than based 

 upon sound calculations, as already said. 



I will not pretend that Mr. Schinz's system is at present of equal 

 advantage for all applications, although it is equally well founded on 

 true principles; but for purposes where intense heat is required, it is 

 certainly the most rational and advantageous of all known. With 

 regard to the presented furnace, I will mention that its first cost is 

 considerable higher than that of ordinary furnaces, but this diiference 

 is made up by the saving in fuel within four to six months. It is 

 not to be denied that a close attention and moderate skill is required 

 for its construction, management, and repair ; but there is no doubt 

 that, with a strict adherence to the rules laid down, an intelligent 

 manager will find no difficulties, when aided by the good-will of the 

 workmen, to obtain all the desired results. 



In the plates / to IV, we have the difi'erent sections of the furnace 

 represented. The six gas-generators are marked A 1 to A 6; the 

 main canal for the fan-blast with £, and the gas-flues, which conduct 

 the gas from the generators into the furnace, with C 1 to 6^6. In 

 plan IV, we have in D the pipes which lead the cold air from B, 

 under the boiler into the hot air pipes F, and from there the heated 

 air goes through H, into the injector J. 



In plan /, we see in K the combustion canal, in which gas and air 

 for combustion are intermingled, from whence they enter with their 

 initial temperature into the furnace, L, thence through the flue, 31, 

 between the boiler and hot-air pipes, to be evacuated in the chim- 

 ney, P. 



The Gas- Generators are, as will be seen in plate / and III, 3' 3" 

 wide, and in the clear, average 4 feet in height. The doors, Fig. 

 1 a, and 1 h, plate V, close the ash-pits air-tight. In them is a small 

 glass plate, to observe the burning of the coal in the generators. 



The step grates are marked in plate ///, with A 1 to A 6, and 



