At nine shillings, it is 9.024 farthings.
TABLE,
Exhibiting a series of experiments, made with a view to determine the real and comparative expence of burning candles of different sorts and sizes.
| Number of candles in one pound. | Weight of one candle. | Time one candle lasted. | The time that one pound will last. | The expence in twelve hours when candles are at 12s. per dozen, which also shews the proportion of expence at any price, per dozen. | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oz. | Dr. | Hr. | Min. | Hr. | Min. | Farthings and hundredth parts. | |||||
| A small wick. A large wick. | 18 | 3⁄4 | 0 | 14 | 3 | 15 | 59 | 26 | 9 | .70 | |
| 19 | 0 | 13 | 1⁄2 | 2 | 40 | 50 | 34 | 11 | .40 | ||
| 16 | 1⁄2 | 0 | 15 | 1⁄2 | 2 | 40 | 44 | 2 | 13 | .08 | |
| 12 | 1 | 5 | 1⁄4 | 3 | 27 | 41 | 24 | 13 | .92 | ||
| 10 | 3⁄4 | 1 | 8 | 3 | 36 | 38 | 24 | 15 | .00 | ||
| 7 | 3⁄4 | 2 | 1 | 4 | 9 | 32 | 12 | 17 | .88 | ||
| 8 | 2 | 0 | 4 | 15 | 34 | 0 | 16 | .94 | |||
| 5 | 3⁄4 | 2 | 13 | 5 | 19 | 30 | 15 | 19 | .06 | ||
| Mould candles. | Moulds at 14d. per dozen. | ||||||||||
| Each. | |||||||||||
| With wax’d wick. | 3 | 7⁄8 | 2 | 12 | 7 | 20 | 42 | 39 | 15 | .74 | |
| 4 | 4 | 0 | 9 | 3 | 36 | 20 | 18 | .56 | |||
| 3 | 5 | 2 | 3⁄4 | 17 | 30 | 52 | 30 | 16 | .825 | ||
The time each candle lasted, was taken from an average of several trials on each size.
It has been suggested by Dr. Franklin, that the flame of two candles joined, gives a much stronger light than both of them separately. The same, has been observed by Mr. Warren, to be the case with flames of gas-lights, which, when combined, give a much stronger light than they would afford, when in a separate state.
Indeed, in all cases, where flames for producing light are placed near to each other, it is always beneficial to preserve the heat of the flame as much as possible. One of the most simple methods of doing this, is no doubt, the placing of the several flames together, and as near as possible to each other without touching, in order that they may mutually cover and defend each other against the powerful cooling influence of the surrounding cold bodies. This principle is now employed in the Liverpool lamp, which acts by several flat or ribband wicks placed in the form of a cylinder. The power of illumination of this lamp is superior in effect and more economical than any other lamp in use—and as flame is perfectly transparent to the light of another flame which passes through it, there is no danger of loss of light on account of the flames covering each other.