Table of contents
April 20, 1861, Volume 4 No 16 (New Series) pp241-254
About the coverNotes and Queries
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Ships' Compasses—Dangerous Attraction—Engines and Iron Hulls - p249
doi:10.1038/scientificamerican04201861-249a
The Polytechnic Association of the American Institute - pp251 - 252
doi:10.1038/scientificamerican04201861-251
