Antique ships log, Thomas Walker Patent Harpoon A1.

Antique ship or yacht log by Thomas Walker

A mid to late 19th century brass mechanical ships log. 

The tail section has multiple fins and rotates when in the water to record the distance travelled in nautical miles, there is a fixed stabilising wing that prevents the log itself from spinning. The distance is recorded on the logs porceain dial, there is three dials - one reads 100 miles, the next dial records tenths of a mile and the last dial is divisions of one nautical mile. There is a rotating brass cover to protect the dials when in use.

The dial plate is marked: WALKER'S, PATENT, HARPOON, SHIP LOG, A1, LONDON.

Length: 21 inches / 53 cm.