as 300 feet and h as 3600 feet. The speed of propagation increases with 

 increasing wave length according to the formula; values range from 9 feet 

 per minute for 4.5-foot waves (the smallest which can just be observed 

 with a 15 sec/cycle time on our recorder) to a maximum of 190 feet per 

 minute for 3000-foot (or greater) waves. 



OBSERVATIONAL NETWORK: 

 As the internal waves, which will be measured, will vary from one 

 lunar day (24.84 hours) to approximately one minute, wave lengths will 

 range from 50 miles to approximately 20 feet. To determine the vector, K 

 (whose direction is the direction of propagation and whose magnitude is 



"wave number") as great a spacing of observations as possible is desirable. 



X 

 However, this spacing can be no greater than 2 Therefore, 3 



different triangular spacings of the temperature sensors used are suggested: 



SPACING 

 (FEET) 



VELOCITY 

 CALCULATED 

 FROM GRAVITY 

 WAVE EQUATION 

 ft/min 



10 



200 



1730 



1 



5 



25 



SHORTEST WAVE PERIOD (MINUTES) WHICH 

 WILL BE DETECTED ASSUMING: 



30 ft/min 



100 ft/min 



3/4 



< 1/2 



13 



4 



120 



35 



The duration of the continuous observation period should be at least 

 a week or more to pick up the tidal cycles. 



The depth of the thermal sensors should be at the mean depth of the 



32 



