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Description: | This instrument is designed to measure the distance covered by a ship. In this design, a brass rotor trails in the water and spins around as the boat moves along. This rotary motion is then passed through a register. Three dials marked '1/4-1', '1-10' and '10-100' give a readout of the distance travelled in nautical miles. The dials are also protected while the log is in the water by a brass swivelling cover. This form of log was patented by Edward Massey (about 1768-1852), whose name is inscribed on the converter, along with the trademark of three Ls in a triangle.
See Board of Longitude Papers, Vol. 25 [old numbering], fols. 14-155
caption: Mechanical log - Whole Item & Rope
caption: Mechanical log
caption: Mechanical log - Detail Screw
caption: Mechanical log - Inscription | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | mechanical logs | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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