- 27 - 



of harmonic coefficients was taken as a first approximation of 

 the open water tidal condition near the coast. 



2/ 



H oi Pi Qi ^ S2 N2 K2 



Pensacola 0.43 0,49 0.13 0.08 0,06 0.02 0.01 0.02 



(1934) 

 Galveston 0.3S 0.35 0.10 0,08 O.3I 0,10 0.08 0.01 



(1939) 



2 ) 0.79 0.85 0.23 0.16 0,37 0.12 Q.09 0.03 

 0.39 0.43 0.12 0.08 0.19 0.06 0.05 0,01 

 Total range 1,24 feet 



The small Q-, and K- constituents were neglected as individuals 

 and their contributions incorporated in the total displacement 0/ 

 the tide machine drums. Three drums were built and driven through 

 a stroke of 2 inches at the following speeds : 



prototype model range radius displ. 



Kj^Pq^ drum 24.00 hrs 60. sec. 0.51 "ft." 5.35 in. 181.0 in.^ 



0]_ drum 25.82 hrs 64,5 sec. 0,43 "ft." 4.92 in. 152.2 in.3 



M2S2N2 drum 12.21 hrs 30.5 sec. 0.30 "ft," 4.10 in. 106.0 in.^ 



sum of all contributions 1.24 "feet" 440.2 in.^ 



The final tests of this tide machine revealed errors of 3.2^ in 



2/ See following page. 



