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DEVELOPMENT OF PRESENT-DAY SUBMARINE 25
nature and of no practical value. From this time on there
was a period of a great deal of experimentation and prac-
tical demonstration, until in 1900 the submarine was
brought up to a point of being of some practical use for
naval purposes, and since then under service conditions
and requirements it has reached a stage of development
where its military values have been amply demonstrated
and assured in actual service of war.