Copper tubes containing a charge of mercuric fulminate alone or mixed with potassium chlorate or other ingredients. Other detonating substances include an aniline derivative named “tetryl”, lead triazide, etc. Detonation requires to be started by a strong impulse such as that imparted by the explosion of a charge of mercury fulminate; it proceeds very rapidly, and is due to the formation of an explosion wave having a velocity of thousands of metres per second. In blasting operations detonators are either tired by a timefuse or electrically.
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