Transactiviis Society Nazvl Architects and Marine Engineers, Vol. 2i, 1913. 



Plate lOj. 



To illustrate paper on "Notes on. Chain Cables," 

 bv Assistant Nai'al Constructor John E. Otterson, U. S. N., Member. 



WORM WHEEL 

 DRIVE 



SPROCKET WHEEL 

 AT HEAD OF CRANE. 



