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Description: | This log glass was used together with a log to determine a ship's speed. The sand takes 28 seconds to run from one half into the other. If you turn the glass over and measure the distance the ship travels while the sand is running, you can calculate the travelling speed of your ship. This method was used before the introduction of mechanical or electronic logs. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | work living in the North East | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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