T.Walker's Patent Harpoon Ship Log A.1
        
        Mechanical log. Walker type A.1 Harpoon Copper with enamel dial.
              
      
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Object Details
| ID: | NAV0723 | 
|---|---|
| Type: | Mechanical log | 
| Display location: | Not on display | 
| Creator: | Thomas Walker & Son Ltd | 
| Date made: | circa 1861 | 
| Credit: | National Maritime Museum, Greenwich, London | 
| Measurements: | Overall: 128 mm x 536 mm x 130 mm |