TIDAL POWER TURNBtTLL 



529 



at every high tide and the gates H, H, etc., of the eastern dam would 

 be automatic flap gates opening downstream, and allowing the low- 

 level basin (the Memramcook) to empty on every ebb tide. 



The gates G, G, etc., and G 1 , G 1 , etc., would be of the nature of 

 lock gates ; they would be operated by electric motors, driven by the 

 power plant itself, and be under the control of the attendants, who 

 would open them and close them in accordance with the height of 

 the external tide at stated times that can be fixed for months in 

 advance directly from the tide tables. 



TYPICAL TIDAL CYCLE - HOPEWELL- Fr.m T, i., E«u 





3 1 s 6 7 & y 



VELOCITY .. CURRENT -HOPEWELL- Fi- 



ll U HOL.ll! 



The power house is represented as a long building, with turbines 

 T, T 1 , etc., extending diagonally from the wing dam to the western 

 dam, and these turbines discharge continuously from the high-level 

 basin into the common triangular tailrace. Let us now follow 

 through a cycle of operations from low tide to the following low tide, 

 remembering that the high-level basin was filled automatically at the 

 last high tide and that the low-level basin has just been emptied 

 during the ebb tide through the gates in the eastern dam. 



