102 LAUNCHING DATA FOR A BATTLESHIP. 



By plotting all of these points, this (indicating) being a tangent of about .055, you will 

 note that before the ship pivoted (the blocking and cradle were constructed so that the trim 

 "of the ship before pivoting was the same as the slope of the ways), and up to the time she 

 commenced to pivot, the tangent of angle of trim of the ship should plot on the line drawn 

 at the value of tangent of the slope of the ways. How near it comes is shown by the observa- 

 tions. This one farthest off represents an angle varying from the slope of the ways by 1/32 

 inch to the foot. The slope is 11/16 inch to a foot. This (indicating) corresponds to 

 23/32 inch. The spots plotted here in this direction (indicating) represent the trim after 

 the vessel begins to pivot and the intersection of this line, drawn through the mean location, 

 with the line representing the tangent of the slope of the ways, gives the pivoting point at 

 560 feet travel. 



I have had kindly loaned to me for exhibition here the complete film record of the 

 launching of the Oklahoma. It was hoped to have that film to reproduce the launching for 

 you. It has been forwarded by express, but has not yet arrived. I have brought with 

 me a short section of the film, all that was in my possession, the part which includes all the 

 pictures from which measurements were taken to prepare the data in the paper. I will 

 now show that part. (The portion of the film referred to was projected on the screen as a 

 moving picture.) 



Mr. E. C. Bennet (Communicated) : — Relative to the paper entitled "Launching Data 

 for a Battleship," read by Naval Constructor John G. Tawresey, it may add interest to 

 Naval Constructor Tawresey's very instructive contribution to the series of papers upon 

 launching published in the transactions of this Society, to cite the main points wherein the 

 launching arrangements of the battleship Nevada differ from those of the Oklahoma. 



The Nevada is the sister ship of the Oklahoma and was built from the same contract 

 plans as issued by the Bureau of Construction and Repair, Navy Department, Washington, 

 so that in all essential particulars both vessels are alike. 



The Nevada was launched from the yard of the Fore River Shipbuilding Corporation, 

 Quincy, Mass., on July 11, 1914, and, like those of the Oklahoma, the formalities were 

 entirely successful. For comparative purposes the principal data for the Nevada are given 

 as follows: 



Declivity of keel blocks, per foot 10/16 in. 



Length of ground ways over all 751 ft. ins. 



Length of ground ways submerged 188 ft. 6 ins. 



Width of ground ways (each) 60 ins. 



Thickness of ground ways 12 ins. 



Declivity of ground ways, per foot 10/16 in. 



Camber of ground ways None 



Inclination of ground ways, transverse per foot 5/16 in. 



Spread of ground ways, center to center 34 ft. 1 in. 



Material of ground ways Yellow pine 



Length of sliding ways over all 467 ft. 



Length of sliding ways effective 448 ft. 



Thickness of sliding ways 12 ins. 



