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  • Navigation: an astrolabe, a cross-staff, and a back-staff or Davis's sextant. Drawing after Edmund Gunter, 1624.
  • Astronomy: a quadrant and a sextant. Engraving.
  • Astronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.
  • Zebrafish posterior lateral line development
  • Navigation: several quadrants and a sextant. Engraving.
  • Astronomy: a diagram showing how to determine latitude. Coloured engraving by J. Emslie, 1851, after himself.
  • Navigation: a man using a Jacob's staff (cross staff), various other measuring devices at his feet. Woodcut, 16--.
  • Navigation: a compass, and details of its use. Engraving.
  • Zebrafish sensory neuromasts
  • Civil engineering: a plan to improve the silted-up harbour at Rye, Kent. Engraving by Mutlow.
  • Ship-building: five kinds of quadrant (top), and two types of telegraph (below). Engraving by Turnbull.
  • Navigation: various navigational aids, including a quadrant and a sextant. Engraving by Barlow.
  • Navigation: a cross-staff or cross-bow, and a sailor using the device. Drawing after Edmund Gunter, 1624.
  • Navigation: a sextant, and detail of the cursor. Engraving, 1768.
  • Astronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.
  • Navigation: a gimbal compass and a sextant. Engraving.
  • Wisdom shows Britannia the measurements of the globe; figures representing other continents stand watching. Engraving by W. Swift after W.M. Craig.
  • Astronomy: a diagram showing how to determine latitude. Coloured engraving by J. Emslie, 1851, after himself.
  • Navigation: a sighting compass. Engraving.