Smithsonian Institution Libraries : Admirals Rodman and Dahlgren were two American inventors who perfected heavy cannon design. The tapered barrel reduced the amount of iron required for the same range. SIL28-090-05

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Admirals Rodman and Dahlgren were two American inventors who perfected heavy cannon design. The tapered barrel reduced the amount of iron required for the same range. , Image number:SIL28-090-05