Table of contents
May 25, 1861, Volume 4 No 21 (New Series) pp321-336
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Derangement and Adjustment of Ships' Compasses - p329
doi:10.1038/scientificamerican05251861-329b
History and Index of Articles on Implements of War, Rifles, Shooting, and Experiments in Gunnery, Published in the “Scientific American” - pp332 - 333
doi:10.1038/scientificamerican05251861-332
Calkin's Transparent Eye Shade, or Occhiombra - p336
doi:10.1038/scientificamerican05251861-336a
