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I

The thyratron will fire.

The arc is struck between the electrode and the charge.

The electric arc is drawn between two electrodes.

II

The sample is placed in the combustion crucible of the calorimeter and ignited by electric connections.

The primary explosive detonates readily when set afire by the primer.

III

The light blinks on as the movement starts.

Источник: Русско-английский научно-технический словарь на Gufo.me