Detail of propeller shaft couplings. 1. underside of shaft beam; 3. upper steel portion of shaft, which bears gear on tp and enters sleeve coupling below; 4. cast sleeve coupling; 5. set screws holding shafts in coupling; 6. short piece of steel shaft; 7. pipe coupling; 8. lower part of shaft made of pipe; 9. measuring stick made of section 6 inches long
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