THE MINIATURE MOUNT VESUVIUS.
Fig. 116.
5th. Having some finely pulverised loaf-sugar and some chlorate of potash, also in powder, the same quantity in weight of each, they are well mixed together and placed in a crockery vessel, which will prevent injury to the table or stand. Having a glass rod for a wand, you have but to dip one end in sulphuric acid, and touch the compound with it, to produce a vivid flame.
6th. In a small retort put an ounce of a strong liquor of potash in water, and one drachm of phosphorus. Dip the mouth of the retort half an inch under water in a saucer. Gradually heat the liquid in the retort with a spirit-lamp until it boils. In a few minutes the retort will be filled with a white cloud, then the gas generated will begin to bubble at the end of the saucer; a minute more, each bubble, as it issues from the boiling fluid, will spontaneously take fire as it comes into the air, forming at the mouth a ring.
7th. Into the jar of chlorine gas pour finely powdered charcoal, when a display of great beauty will be made.
8th. A grain of potassium mixed with the same quantity of sodium is to have a drop of quicksilver added to it, when agitation of the three will cause them to ignite and burn brightly.
9th. Potassium and sulphur, heated together, will show a brilliant light. Or, holding some nitre on a metal plate, flowers of sulphur sprinkled on it will ignite. Be careful not to breathe the fumes of sulphur at any time. Iron filings thrown upon red-hot nitre will burn and explode.
10th. Put some phosphorus in a bottle of water, in the proportion of ten grains of the former in one ounce of the latter, and, boiling it over a lamp, fire will burst forth, each particle of the phosphorus becoming a flaming ball, which will beautifully coruscate.
11th. Make a solution of tartaric acid, which, poured into sugar of lead dissolved in distilled water, will precipitate a white powder. Dry this sediment, and put it into a glass phial. Cover this with clay, and bake it in an oven. Now you can put this phial upon a charcoal fire, which you will increase in power until the glass is red-hot and no smoke leaves the mouth; stopper it up with a dab of clay or a lump of mastic, and take it away from the fire to cool. The contents are now fine powdered lead intermingled with the charcoal of the tartaric acid, which will take fire on contact with the open air. Iron and other metals, when reduced to an impalpable powder, will similarly ignite in the common air.