Transactions Society Naval Architects and Marine Engineers, Vol. 24, 1916. Plate 123. 
To illustrate paper on “The Commercial Gyroscopic Compass,” 
by Elmer A. Sperry, Esq., Member. 
Fic. 2—Futt EourpMent witH REPEATERS, PELorus, DousLe Moror-GENERATOR, AND BATTERY. 
