LOADS ACTING ON A SHIP AND THE ELASTIC RESPONSE OF A SHIP 



299 



"" Per day if not otherwise noted. 



' In 10.(i-hr period. 



' In 14-hr period. 



'' Total number of counts over 500 psi was approximately 450,500. 



1 Kent, Kcmpf, and Hoppe data de.scril)ed in Sec- 

 tion 3-5.11 and Table 3-3. 



2 Schnadel's data described in .Section 3-5.12 and 

 Tables 3-4 and 3-5. 



3 Data of the Admiraltj^ Ship Welding Committee on 

 SS Ocean Vulcan. General description of the obser- 

 vations was given in Section 3-5. L3. Tables of stresses 

 measured under different weather conditions are given 

 at the end of Report No. 8. This report also contains 

 a summary of stresses measured by pre\-ious in\'esti- 

 gators on several ships. 



4 Data obtained on SS Nissei Maru as described in 

 Section 3-5.15 and in Tables 3-8 and 3-9. 



5 Data obtained on SS Mormacmail and SS Mor- 

 macpcnn as reported b.y E. V. Lewis (1957c). 



For the purpose of the present monogra]jh it will be 

 sufficient to discuss the last set of data. Strain gages 



and stress cycle counters were installed by the David 

 Taylor ]Model Basin under weather decks of two C-3 

 type cargo ships. On each ship there was a gage on one 

 side of the ship onlj^. The counters were arranged so 

 that they counted all of the ranges of stress (hog + sag) 

 exceechng each of the following levels: 500, 4000, 8000, 

 12,000 16,000, and 20,000 psi. The counters were read 

 once each watch by the ship's officers. Once a day 

 weather, sea conditions, ship speed, and course also were 

 recorded. These data were tabulated and presented to 

 S-10 panel of The Society of Naval Architects and Marine 

 Engineers by E. V. Lewis (1957c). The data were ob- 

 tained during seven voyages of SS Mormacmail and five 

 voyages of SS Mormacpenn. The voyages (double 

 crossings) were made over the north part of the North 

 Atlantic between northeast coast ports of the I'nited 

 States and Scandinavian and Baltic sea ports, occasion- 



