Abstract Joseph Martin, a ship's boy on the merchant vessel Pacific, kept this ship's log during two 1820s voyages: Philadelphia, to Antwerp (Belgium), to Crounstant (likely Kronstadt, Russia), and back to Philadelphia with Captain Abiah Sharpe; and Philadelphia to Madras (India) and back with Captain James Moore. In addition to standard nautical data, Martin added a small number of illustrations, some in color, and many nautical and mathematical exercises, including...