IRON MANUFACTURE. A79 
much more than the ‘“ flue-cinder” from the reheating furnaces. This 
variability in the mill-cinder has led to some trouble in its use. The 
plan is to use Lake ore and mill-cinder in such proportion as to 
bring the phosphorus in the iron sufficiently low to make it of the 
desired quality. If, however, the mixture found satisfactory with one 
grade of cinder is to be used with another, which has much more phos- 
phorus, a falling off in the quality of the iron will be at once apparent. 
That this may occur will be shown by the following figures. The 
samples were sent by furnaces as representing cinder in use: 
1. 2. 3. 4, 5. 6. 7. 
OTM eee aoe tate lub Deanne Locoe oe uecalewie AVE) Ih t0){9 Hoccooados 240i eh Oa ORE eee 
| PAVE EF DLOOTPWYS! , c0400000050000100000000060 000000000 0.382| 1.80) 0.683) 1.70) 2.21 | 1.76 Pant 
Lorp, Chemist. 
Nos. 5 and 7 are of interest, as they were used in admixture with 
Lake ore, and the trouble experienced in getting strong iron was charged 
to the Lake ore, which on analysis showed, phosphorus, 0.18, present. 
The amount of iron in the cinder is more nearly constant, but 
still there are occasionally great variations, but usually accompanied 
by change in the appearance of the cinder. A glassy cinder, which 
appeared to work poorly, yielded the following analysis: 
STITT Cee Rear te reser deta ake ataia lad aris stacseisiach clave walerstersia Sonera atcha Ede Ve salaareso 35.88 
LEROY, open beteeSConGOSC CREAT GOB ONG OC CCE OOO DECOR COE CERO PE eee nt ea ann bate 35.15 
OSD OLUS cere sect arose coos denncetnsaccibes veceasuuoacnclmuvastiouess conse cacecste ceed 0.84 
Lorp, Chemist. 
This cinder is exceptional, but still serves to show the possible 
extent to which the material, so generally accepted as uniform, may 
vary. ‘This was not a selected piece, but represented a car-load of mate- 
rial shipped to a furnace. 
The total capacity of the iron furnaces of the Hocking Valley 
district may be estimated at about 150,000 net tons. The production 
in 1880 was nearly 116,000 net tons of 2,000 lbs., including the Colum- 
bus and Zanesville furnaces, which properly belong to and are included 
in this group of works, as they use the same fuels and ores. By a recent 
change in the management of several of the furnaces of the Hocking 
