Iran, ^7 3^7 
125 
Feet. In. 
Diameter of the nose of the tweer 3 ir u by 21-2 in. 
. — — — - — — — drums 6 
Depth of the drams 5 
Strokes in a minute 4 1-2. 
Hearth from the bottom to the boshes 4 $ 
Dam stone siliceous grit, calculated to last about 
six month So 
45 cwt. of ore to a ton of metal. 
Charge of ore 3201b. 
coal 15 bushels, each from 14 to 151b. 
limestone 401b. 
Charges run every 24 hours : 27 to 28. 
Wages of carters, banksmen, ore diggers, 61 1-2 cents 
per day. 
- — — Fillers 76 cents: ore pounders 69 cents: 
gutter man 53 1-2 cents: blacksmith 92 cl s. 
» Founder 100 cents per ton for pig metal and 
266 1-3 cents per ton for hollow ware. 
Charcoal 200 bushels to a ton of metal. 
In erecting a blast 1'umace, either sand- stone that will 
bear the fire, or fire brick should be employed. Sand- 
stone newly dug out of the ground will be found to con- 
tain near ten per cent, of moisture imbibed. If therefore 
a furnace should require 1000 ton of stone, 100 ton of 
vapour will require to be dissipated. This can be ascer- 
tained by exposing a pound of your stone, to a red heat 
for two hours, weighing it before and after. 
The vents or flues to let out the steam may be repeated 
every 4 or 5 feet high, and filled with irregular loose stone ; 
they may be 6 inches diameter. 
The nose of the tuyere, ought to be kept well plaister* 
ed with refractory clay, else the iron is very much dispo- 
sed to burn. 
Of the blast , and the mode of applying 
it. In ah 
