N0 - 15 APPENDIX . 145 



ing resistance-curve was found to be very similar to the broken curve in Fig. 

 3, PI. VI, except that the resistance is a maximum at a slightly higher velo- 

 city than in that case. This result agrees well, as far as the transverse waves 

 are concerned, with the experimental results. Even the absolute height of the 

 transverse waves indicated by the photographs on PI. XVI, seem to agree in 

 order of magnitude, with theory. 



19 



