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Sestrel-Luard conversion protractor
This course indicator comprises a flexible rule (scaled in inches) pivoted in two 360-degree compass cards. The bottom card carries a magnetic variation scale and a compass error check scale, all in black. The top card has a red deviation scale and two setting arrows, all in red. The Sestrel-Luard was designed by Commander W.B. Luard, RN, as a replacement for the parallel rule for use with charts. The instrument allows one to plot true, magnetic or compass courses or bearings.
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Object Details
| ID: | NAV0093 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Course indicator |
| Display location: | Not on display |
| Creator: | Henry Browne & Son; Luard, W B |
| Date made: | 1900; circa 1960 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | 5 x 528 x 133 mm |
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