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Related Terms:
Definitions:
Noun
                                                
                        
                            patent log
                        
                                                
                        
                            screw log
                        
                                                
                        
                            taffrail log
                        
                                                
                                                    
                
                    
                    Definition: a cigar-shaped log with rotary fins that measure the ship's speed
Definition: A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.