10 per cent. on £7,500 | 750 0 0 | | Accumulators: | | | 15 per cent. on £9,600 | · · | | Mains: | | | 7½ per cent. on £20,430 | 1,532 5 0 | | 2½ per cent. on £26,262 | · · | | Regulating gear: | | | 10 per cent. on £500 | 50 0 0 | | 10 per cent. on £2,500 | · · | | +-----------------+ 4,683 5 0 | | +-----------------+ | |11,939 13 0 | | +-----------------+ 2,100 units × 365 days | | | = 766,500 units. | | | Cost per unit | · · | 3·75_d._ | ==================================================================== | Continuous Battery | | Transformer System. | -------------------------------+-----------------+-----------------+ _Materials_— | £ _s._ _d._ | £ _s._ _d._ | Coals: 4,380 tons at 17_s._ | · · | | ” 2,550 ” 17_s._ | 2,167 0 0 | | Oil, water, and petty stores: | | | 1,500 hours at 7_s._ 6_d._ | | | 7,250 hours at 1_s._ | · · | | 1,400 hours at 5_s._ | 350 0 0 | | Total cost of material +-----------------+ 2,517 0 0 | | | | _Labour_— | | | 2 foreman drivers at 45_s._; | | | 6 drivers at 30_s._; | | | 9 firemen at 24_s._; | | | sundry labour | | | | | | 1 foreman driver at 45_s._; | | | 2 drivers at 30_s._; | | | 3 firemen at 24_s._; | | | sundry labour | 975 0 0 | | | | | _Salaries_— | | |