R. Austin Freeman, The Singing Bone — The Echo of a Mutiny (1912)
“ A sailor's sheath-knife takes a deal of shaking out as a rule. It is intended to be used in working on the rigging when the man is aloft, so that he can get it out with one hand while he is holding on with the other. It has to be and usually is very secure, for the sheath holds half the handle as well as the blade. What makes one notice the matter in this case is that the man, as you see, carried a pocket-knife; and, as this would serve all the ordinary purposes of a knife, it seems to suggest that the sheath-knife was carried for defensive purposes: as a weapon, in fact. ”
