Product images of Navicula de Venetiis, reverse
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Navicula de Venetiis, reverse
Navicula de Venetiis for latitudes 20-65 North. The main body of this instrument is topped by a castellated poop and forecastle and a mast. Its obverse side is inscribed with vertical hour-lines and there is a declination scale at the bottom of the instrument for setting the mast. The right-hand side carries an arced declination scale for the bead. On the reverse side, the left-hand quadrant contains a shadow square, the right-hand quadrant a degree scale. There is also a set of unequal hour lines for reading the planetary hours between sunrise and sunset. The 'mast' rule passes through the main body of the ship and is pivoted by a rivet at the centre of curvature of the instrument. A line down the centre of the part of the mast that extends below the ship is used to set the declination. The obverse side of the mast carries a latitude scale and the reverse side displays a list of towns and cities in England and their latitudes.
- Image reference: D9015
- National Maritime Museum