Melts Hardest Steel.
This substance known as "thermit" is in current use for repairing, heating or soldering large pieces of metal and consists of a mixture of aluminum and oxide of iron, the latter being replaced, according to the requirement, by oxide of lead, peroxide of sodium or peroxide of barium. This composition is thoroughly mixed together, or is used in the form of cartridges or tablets, which ignite by means of a piece of magnesium fixed in the substance like a wick. The heat developed is more than sufficient to cause the hardest steel to melt.
Although this process is rapid and silent and really marvelous from the point of view of the result obtained, it is not without much danger to those using it, for at the high temperature produced by it an inexperienced operator runs the risk of being seriously burned. In consequence the prudent and careful burglar uses accessories which render him secure against such accidents. He protects his eyes by means of heavy dark glasses, wears shields of aluminum over his hands and applies the mixture through a small hole in the bottom of a crucible. When the reaction takes place it lasts long enough to allow the operator to charge the crucible again and again in proportion as the melting of the metal plate is effected, thus making an opening of the desired size in the safe. It is a simple enough operation for a skilled burglar, but a very dangerous one for an amateur.
Tests with Electricity.
But even this has been discounted by an experiment before a United States government commission, showing that electricity can be so applied as to give the scientific cracksman a greater field for operation than ever before. The experiment was made by an expert burglar, who, having retired from business after amassing a sufficient competency, was requested to favor the commission by contributing the light of his knowledge.
He demonstrated that by the aid of electricity he could, within a short time, reduce safes of the highest repute to old iron. For this purpose he took out of his pocket a style in the form of retort carbon, similar to those used for arc lamps; a few yards of electric wire, black eyeglasses and a plate pierced in the middle. It was with this simple outfit he pierced in less than three minutes a circle of holes in a cast steel safe with walls one and a half inches thick.
His method of procedure was simplicity itself. To the electric supply current of the chandelier overhead he connected two wires, one of which he fixed on the safe, and the other at the extreme of his carbon style. It was suitably insulated by a wooden handle. Then, having inserted this pencil in the hole of the plate, whose purpose was to protect him against the heat and light, he produced a voltaic arc of immense power between the point of his style and the wall of the safe, thus melting the metal with the greatest ease.
Some Concrete Examples.
Burglars Use Acetylene Flame to Open Safe Door.
In Paris, January 4, 1908, burglars broke into the premises of Martin and Baume, colonial traders, at Marseilles, and stole money and goods to the value of $20,000. Most of their booty they took from a safe, the door of which they burnt through with an apparatus giving an acetylene flame of sufficient heat to melt the metal.
The case recalls one at Antwerp recently, when the thieves melted a safe with a combined oxygen and acetylene flame.