172 J. Wharton on the Manufacture of Spelter. 
facture became very scarce. 
e factory was, however, driven unremittingly, 
operations during the year 1861 were as follows: 
Days work of 1 furnace, 41414 
Days work of 1 retort, 223,548 
Retorts consumed in 1861, ~ 12,986 3:14 "085 
Condensers “ - 34,425 8°31 "154 
Rawore “| ut 11,994,794 Ibs. 2,897Ibs. 53°66 bs. 
Roasted ore “ “ 9,879,000 “ 2,386“ 4419 
lcoal “ (including steam power, - 
pottery, &c.,) 18,948,273 “© 4,577 * 84°76 © 
Charge coal consumed in 1861, 3,709,350 “ 896 “ 16°59 © 
Spelter produced, “ 3,158,630 * 763% 1417" 
Per centage yield of ore counted as raw, 26°33 p. 
Per centage yi f ore counted as roasted, Ed tes 
Loss in weight of Raw ore by ng. 7 
I of Coal consumed to Spelter made, T1T tol 
Average duration of Retorts in days, 172 
Average duration of Condensers in days, 
The total amount of wages paid for the year, for all pe 
except the office expenses, a $44,113.54 or per 1000 lbs. of 
spelter produced $18.96. 
The total cost of spelter in 1861, including not only ore, coal, 
materials and wages, but also rent, repairs, contingett 
tenet Z 
and office ex outlay in fact except selling &” 
penses—every 
pense—was $34.70 per 1000 lbs. at the factory. e net average 
price received for spelter sold in 1861 was $42.97 
per 1000 Ibs. 
