THE MOUNT DESERT REGION 55 



The water retiiriiiiig' from the wooden tank is carried 

 through other lead-lined pipes and then fed to the aquaria 

 through hard rubber spigots that are burnt and not soldered 

 into the lead pipe. Therefore, no water coming into the 

 laboratory touches anything but lead, wood, and hard rubber, 

 consequently is non-toxic, and no allowance need be made for 

 error due to contact with metal. 



The drainage from the aquaria runs down along the bench 

 and then flowing through a 2-inch vent drops into a large 

 V-shaped trough that runs to the edge of the beach. I men- 

 tion this particularly because there is always so much sedi- 

 ment washed into a drainage pipe in a laboratory that it 

 clogs things up and makes a lot of trouble. AVith an open 

 V-shaped trough the sediment can be swept down every 2 

 weeks with a whisk-broom and no pipes w^ll be clogged. 



The other drainage pipes from the laboratory run inde- 

 pendently and as no connection is made the contamination 

 by gas is eliminated. The power for regulating the pump 

 is supplied by a General Electric motor attached to the pump 

 by direct drive and was built for me by the National Lead 

 Company, who also made the special lead valves and supplied 

 the pipe, etc., according to my measurements. I wish to 

 express here my appreciation of their care, because the high 

 tides, the level at which the laboratory had to be placed, and 

 the consequent level of the tank, necessitated most careful 

 attention to angles laid out in the plan. 



The pipe i^ 1? inches in diameter and of i-inch lead covered 

 with steel. The lead lining is backed on the flanges and when 

 the pipe is coupled a thin washer of rubber is also placed 

 between the flanges. All valves are of the cone type of solid 

 lead especially constructed for this purpose. 



The connection from the pump to the line of pipe running 

 along the dock is of lead, with a curve sufficient to take up 

 any contraction or expansion due to changes in temperature ; 

 and where the pipe runs along the dock it is covered over, as it 

 is between the dock and the laboratory, to keep the water 

 as cool as possible before reaching the tank. 



