Transactions Society Naval Architects and Marine Engiméers, Vol. 24, 1910. Plate 5. 
Yo illustrate paper on “Salvage Equipment Used in Raising Submarine F-4,” 
by Naval Constructor J. A. Furer, U. S. N., Member. 
Fic. 3—MetHop or SecurInG CHain By Means or CLAMP. 
Fic. 4—Pontoons Unper Construction, SHowinc Mippirt BULKHEAD. 
