1918.] The N.Z. Journal of Science and Technology. 101 
Table 5. 
Calcium Carbide. — Cost of producing 1,500 Tons per Annum of Packed 
Carbide of 86 per cent. Quality, corresponding to a Furnace-yield of 
1,575 Tons, requiring a Furnace of 1,240 Horse-power and a Total 
Power for all Purposes of 1,365 Horse-power. Capital Investment, 
£16,000. 
—_ 
Per Annum. 
Per Ton. 
£ 
£ 
s. 
d. 
Coke : 0-6 x 1500 = 900 tons, at £1 10s. 
. . 
• • 
1,350 
0 
18 
0 
Lime : 0-95 x 1500 = 1,425 tons, at £2 12s. 6d. 
. . 
3,741 
2 
9 
10 
Power : 1,365 h.p., at £4 per horse-power year 
5,460 
3 
12 
10 
Labour:— 
£ 
s. 
d. 
Furnace-room men, 9 at £4 per week 
36 
0 
0 
Electrode-mounter, 1 at £4 per week 
4 
0 
0 
Regulating-boys, 3 at £2 per week 
6 
0 
0 
Crushing and packing, 6 at £3 12s. per week 
21 
12 
0 
Raw materials, 3 at £3 per week 
9 
0 
0 
Foreman, 1 at £5 per week 
5 
0 
0 
Men and boys, 23, per week .. 
81 
12 
0 
Total per annum 
. . 
4,243 
2 
16 
5 
Renewal of electrodes : 69-3 lb. at 4d. per pound 
= £1 
3s. 
2d. 
per ton of carbide: 1,500 tons at £1 3s. 2d. 
1,738 
1 
3 
2 
Maintenance and renewals of furnace and plant 
600 
0 
8 
0 
Packing, at £2 10s. per ton 
3,750 
2 
10 
0 
Management and general 
1,875 
1 
5 
0 
Depreciation, at 8 per cent, on capital 
1,280 
0 
17 
1 
Total cost of production .. 
23,412 
16 
0 
4 
Profit at (say) 10 per cent, on capital 
1,600 
1 
1 
4 
Selling-price 
25,012 
17 
1 
8 
Table 6. 
Calcium Carbide.-—Cost of Producing Carbide for Large Output of 6,000 Tons 
per Annum and over, given by Mr. Charles Bingham in his Work on the 
Manufacture of Carbide of Calcium. 
(The itemized values are per ton of furnace output, with an additional item to cover 
losses in crushing and packing. The total cost is therefore per ton of packed 
carbide.) 
Per Ton. 
£ s. d. 
Coke, at 22s. per ton . . . . . . . . 0 13 8 
Lime, at 23s. per ton . . . . . . . . 1 1 10 
Power .. .. .. .. .. ..136 
Labour . . .. . . . . .. 0 19 3 
Renewal of electrodes.. .. .. .. ..090 
Maintenance and renewal of plant .. .. ..032 
Packing . . .. .. . . . . 1 10 0 
Management and general .. .. .. ..1111 
Depreciation .. .. . . . . 0 10 10 
Losses in crushing and packing . . .. ..033 
Total cost of production 
.. £8 5 7 
