Object Record
Images
Metadata
Catalog Number |
58.10 |
Object Name |
Log |
Title |
Ship's Log |
Artist |
Porter, David, and David Connor, attributed |
Artist 2 |
Connor, David, Commodore |
Date |
early 19th c. |
Description |
This ship's log consists of a vertical-turned brass rod with a slot in the top for a pulley or fulcrum which is missing. A pair of shorter rods support between them a pivoted brass quadrant which is scaled but not numbered. The base is scaled radially from the axis of the quadrant. Inscribed "Porters A Conno(e)r" on the base. Paper on underside label marked "Porter Constant Log." (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961). |
Label |
Ship’s logs, also known as maritime logs, were instruments used to measure a ship’s speed. They were developed in the 16th century to help improve accuracy of speed measurements, crucial information to ensure safe navigation. Most logs included a weight attached to a line, which was let out behind the vessel for a specific interval of time. Once retrieved, the speed of the ship could be determined by dividing the length of the line by the time interval. This ship’s log is missing the weight and line, and there is no clear evidence regarding its maker. APS records suggest that it could have been related to Commodore David Porter and Commodore David Connor, both members of the American Navy with Philadelphia connections, but there is no further support for that conjecture. |
Material |
Instrument: brass; Base: wood |
Dimensions |
H-12.5 W-6.25 L-11.5 inches |
Credit line |
American Philosophical Society |
Search Terms |
19th century nineteenth century navigation measurement invention scientific instrument nautical |