98 Onthe Blast Furnace in the Manufacture of Iron. 
by the combustion of gas without any other fuel, has been in 
successful operation at the above locality for several years, and it 
has been followed with a great improvement in the quality of the 
iron and has reduced the loss to one fourth of what it was ori- 
ginally. 
This method of rofitiing the pig yhae sake been in active opera- 
tion in a number of places, and whenever properly executed, is 
always attended with economy and success. M. d’Andelarre, in 
one of the departments of France, in a letter states, “our pud- 
dling furnaces, heated altogether by the gas lost from the mouth 
of the blast furnace, has been attended with the most complete 
success, which rarely happens in the first attempts at the applica- 
tion of any improvement, which most generally require long ex- 
perience. We lighted up our furnace on the morning of the 5th, 
and put in the first charge at 11 o’clock on the ener of the 
6th, and shingled the same at three-quarters past 12. | The ac- 
complishment of the results so eae passed our —— 
resulting in 
“Ist. An economy of the total amount of fuel wast in i re- 
fining of iron, (which, in a furnace with two doors, amounted, 
in witty Four pees to 6,000 areas omnes ona —_ 
twelve dollars.) . 
_ & 2d. Improvement inte miadliwot seichinis 2. 
_ 3d. The loss was very small, vanes 5 aoe of 20 per cent 
which it is by the old processes. 
“Ath. 'The operations of the iaaiat are snohabs iste: 
Here we see that the experience of M. d’Andelarre accords ex- 
actly with that of M. Dufaur, and already have Russia, Prussia, 
Sweden and Germany sent commissioners to Wasseralfingen, to 
study the processes as they are there carried on. ‘The govern- 
ment of Wurtemburg have opened their works to the inspection 
of all who may wish to make themselves acquainted with their 
character. 
The advantages arising from the employment of ss waste 
gas from the mouth of the blast furnace, is no longer problemati- 
cal, and as some of those interested in this matter may not be ac- 
quainted with the method by which the gas is collected and em- 
ployed, a few words explanatory of it will not be out of place. 
» The gas, as it rises through the fire room of the furnace, con- 
taining 1 from 60 to 80 per cent. of the combustible effect of the 
