Statistics for occurrence #1 of “Colonel Mallet” in chapter 10 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...herical or elongated, it was almost impossible to tell along which lines the case would break, since the interior surface was symmetrical and parallel to the exterior. To effect the desired object, Colonel Mallet proposed to cast shells with the polyhedral cavity, so that there would be certain lines of least resistance, along which the shell would be certain to separate. Prior to the invention of this de...
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