Transactions Society Naval Architects and Marine Engineers, Vol. 2j, l()ij. 



IHalc j6. 



To illustrate paper on "Variation of Frictional Resistance of Ships zvith Condition of Wetted 

 Surface," by Nava! Constructor William McEntec, U. S. N., Member. 



SCALE FOR SPEED IN KNOTS PER HOUR. 



