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Derangement and Adjustment of Ships' Compasses

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General James' Projectile

Letter from our Washington House

History and Index of Articles on Implements of War, Rifles, Shooting, and Experiments in Gunnery, Published in the Scientific American

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Thayer's Improvement in Harvesters

Calkin's Transparent Eye Shade or Occhiombra

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    Notes and Queries - May 25, 1861

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