In later years Ericsson devoted himself to the study of torpedoes and sun motors.
Mines, torpedoes and submarines were all employed, and with the "Monitor" may fairly be said to have begun the application of mechanical science to the uses of naval war.
Other schools are the school of naval medicine at Bordeaux with annexes at Toulon, Brest and Rochefort; schools of torpedoes and mines and of gunnery at Toulon, &c., &c. The coles dhydro graphic established at various ports are for theoretical training for the higher grades of the merchant service.
There are also directors of stores, of naval construction, of the medical service, and of the submarine defences (which are concerned with torpedoes, mines and torpedo-boats), as well as of naval ordnance and works, The prefect directs the operations of the arsenal, and is responsible for its efficiency and for that of the ships which are there in reserve.
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