THE SYMPATHETIC LAMP.
This lamp is put upon a table; the conjurer gives a signal to the assistant to blow in a pipe, without directing the wind to the place where it is laid, and nevertheless it extinguishes it immediately, as if some person had blown it out.
Explanation. The stand which holds the lamp contains a pair of bellows in its base, by which the wind is conveyed straight to the flame through a little pipe. An assistant under the floor (or behind the curtain), by moving machinery concealed under the table, works the bellows below to extinguish the lamp at the moment desired.
PROOF THAT FLAME IS HOLLOW.
Pour some spirit of wine into a watch-glass, and inflame it; place a straw across this flame, and it will only be ignited and charred at the outer edge; the middle of the straw will be uninjured, for there is no ignited matter in the centre of the flame. Or if you hold a card over a candle-flame where it will be singed you will find a browning ring and not a solid scorch.
MAGIC LAMP.
Put some granulated zinc in an ordinary wine-bottle, and pour in a mixture of water and sulphuric acid, four parts of the former to one of the acid; through a hole in the cork run a glass tube, and cork the bottle. The decomposition of the water will send up some hydrogen gas, which will drive out the common air, and then the touch of a light to the tip of the tube will inflame the gas as it rises, and produce a faint light, scarcely visible by day. The heat, however, is so intense that it will melt metal and make platinum white hot. You may collect the steam inside a tumbler held over the flames, being caused by the hydrogen forming water by its union with the oxygen of the air.
2nd. In the cork of a jar of oxygen, is a long wire, at the lower end of which is a copper cup, to contain a piece of lighted phosphorus. In an instant a light more extreme than the sight can sustain, is produced and the bottle will seem to be full of light. Pure oxygen would probably cause the jar to be burst by its heat, so its weakening by one-quarter of its bulk by air will be advisable.
3rd. Fasten a point of charcoal on the end of a coil of soft iron wire, which is hung from the cork of the jar of oxygen, and on lighting the charcoal the flame will catch the wire and throw out a brilliant light. The sparks will be formed by the union of the metal and gas forming oxide of iron. They will be very hot, and may even pierce the side of the bottle.
4th. Light some sulphuret of carbon in a dish, and on presenting a brush of steel wire to the flames an illumination will be had.