J. Wharton on the Manufacture of Spelter. 173 
In the year 1862 the supply of ore was of somewhat inferior 
quality, yet by the sliding scale of price payable under the 
contract it cost more per ton than in 1861; these disadvantages 
nearly neutralizing those economies which greater experience 
and continual diligence rendered possible. 
The cost of spelter in 1862, including as in 1861 all items of 
expense except interest on working capital, but excluding sell- 
ing expenses or any allowance for my own exertions, was 
$34.55 per 1000 Ibs. at the factory. 
The particulars of operations for 1862 were as follows: 
Perdiem Per diem 
per furnace. per retort, 
Days work of 1 furnace, 4,705 
Days work of 1 retort, 258,509 
torts consumed in 1862, 13,614 2°89 “053 
Condensers «“ 47,870 10-17 185 
= . 14,209,169 lbs. 3,020Ibs. 54°91 lbs. 
ore ve 12,532,130 * 2,664 “ 48-44 “ 
Fuelcoal « (including steam engine, 
pottery, &c., 26,451,844 “ 56,622 “ 10222 “ 
Fuel coal“ (in Spelter furnaces alone,) 22,236,164 “ 4,726 * 86-02 “ 
Charge coal 5,296,256 “ 1,126 * 20-47 “ 
New refracting material consumed, 1,974,919 “ 439-8 Pe * 
Old do. 4“ (b 
g, retorts, &e.,) 1,090,199 “2 99, 400." 
Spelter produced in 1862, 3,704,676 “© = 787 * 1431 
Li tage yield of ore counted as raw, 26°07 p. c 
Per centage yield of ore counted as r 956 “ 
Loss in weight of Raw or by roasting, "3 
Ratio of C dto Spelter made, 8.57 to 1 
Average duration of Retorts in days, 18-99 
= uration of Condensers in days, 5°40 
The total amount of wages paid in 1862 for all purposes ex- 
vy office expenses (and for brick-making as below stated) was 
| P 
oe ry 
» fd by roasting but water. 
Apri} lease of the factory was extended from January 1, to 
_ “Pr 1, 1868, in order to compensate for certain deficient de- 
