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A pair of tiny electrolytic plates convert the liquid into oxyhydrogen, a violently explosive gas.

The oxyhydrogen blowpipe, invented by Dr. Hare in 1801, is an instrument in which oxygen and hydrogen, taken from separate reservoirs, in the proportions of two volumes of hydrogen to one of oxygen, are burned in a jet, under pressure.

Long before the Ambrotype days, pictures were taken on glass and thrown upon canvas by means of the oxyhydrogen light for the use of artists.

Then with a stick of brass wire in the left hand, and an oxyhydrogen blowpipe in the right, we should direct the flame from the pipe on to the metal until, at one point, the sides of the groove were beginning to melt.

The oxyhydrogen flame has a temperature of about 2000� C., hot enough to melt fire-clay.