Engraving depicting John Philip Holland's submarine under trials for the US Navy. The inset picture shows how the boat was controlled from the central turret. The controller looked out through two bulls-eye glasses placed at a convenient distance apart for the human eyes. John Phillip Holland (1840-1914) an Irish engineer who developed the first submarine to be formally commissioned by the US Navy, and the first Royal Navy submarine, Holland 1. Dated 19th century - Stock Photo
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