|____________|____________________|______|_________|__________|_________|
| | | | | | |
| Candles |"Wax" (so-called) . | Nil | 100.5 | 13.7 | 2700 |
|____________|____________________|______|_________|__________|_________|
| | | | | | |
| | Small glow . . . . |2s.6d.| Nil | Nil | 285 |
| | Large glow . . . . |2s.6d.| " | " | 360 |
| Electricity| | [5] | | | |
| | Tantalum . . . . . |7s.6d.| " | " | 172 |
| | Osram . . . . . . | 6s. | " | " | 96 |
|____________|____________________|______|_________|__________|_________|

[Footnote 1: Interest and depreciation charges on generating and
purifying plant = 0.15 penny. Purifying material and burner renewals =
0.05 penny.]

[Footnote 2: Mantle renewals as for coal-gas.]

[Footnote 3: Renewals of wicks and chimneys = 0.02 penny.]

[Footnote 4: Renewals and mantles (and chimneys) at contract rate of 3s.
per burner per annum.]

[Footnote 5: Renewals of lamps and fuses, at price indicated per lamp per
annum.]

The conventional method of making pecuniary comparisons between different
sources of artificial light consists in simply calculating the cost of
developing a certain number of candle-hours of light--_i.e._, a
certain amount of standard candle-power for a given number of hours--on