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Log glass
The log glass was used in conjunction with a log and line in order to time the period during which the log line was allowed to unroll from the log reel and so estimate the ship's speed from the amount of line paid out. Usually this was for a period of up to half a minute. This brass log glass timed a period of 28 seconds and has the number 28 inscribed on both ends.
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Object Details
| ID: | NAV0751 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Log glass |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | 19th century; circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 85 mm; Diameter: 28 mm |
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