- 27 - 



of harmonic coefficients was taken as a first approximation of 

 the open water tidal condition near the coast, 



2/ 



Kl Ol Pi «1 M2 S2 N2 K2 



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



(1934) 

 Galveston 0.38 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 0.09 0.03 

 0.39 0.43 0.12 0,08 O.I9 O.O6 0,05 0.01 

 Total range 1.24 feet 



The small Q^ and Kp constituents were neglected as individuals 

 and their contributions incorporated in the total displacement of 

 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. 



K3_P3_ drum 24.00 hrs 60. sec. 0,51 "ft." 5.35 in. 181.0 in.^ 



Ol 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. IO6.O in.-^ 



sum of all contributions 1,24 "feet" 440,2 in,"^ 



The final tests of this tide machine revealed errors of 3*2^ in 



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2/ See following page. 



