Statistics for occurrence #1 of “Cyrus Alger” in entry cannon of Harper's Encyclopedia of United States History:

...Kemble, president, for the West Point Foundry Association, for thirty-two 42-pounders, long guns, July 11, 1820. First gun rifled in America at the South Boston Iron Company's foundry, 1834. Cyrus Alger patents and makes the first malleable iron guns cast and converted in an oven, 1836. Earliest piece of heavy ordnance cast at the South Boston foundry, a 10-in. columbiad, under the supervision...
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