What is the difference between percussion torpedo and magnetic torpedo?

A modern torpedo is an underwater ranged weapon launched above or below the water ... The term torpedo originally applied to a variety of devices, most of which ... Two steel drums were mounted one behind the other inside the torpedo, each ... the ship, relying on a magnetic exploder to activate at the appropriate time.

Explanation:

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

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