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Small in size, of no battery-force except against boat attacks, loaded with combustibles and powder, success in the use of them under an enemy's guns required not only imperturbable coolness and nerve, but the utmost attainable immunity from the attention of the enemy. This could be secured only by a heavy and sustained fire from their own fleet.
Now the size, or diameter, of a telegraphic conductor is just as important an item, in determining the strength of current which can be maintained upon it with a given amount of battery-force, as the length of the conductor.
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