SUNIER: The Laboratory for Marine I nvestigaiions. 



137 



a common bed plate to an A. E.G. induction motor of 1 H. P., 1450 R. P.M., 

 fitted with a starting resistance. 



The housing of the centrifugal pump, with which the sea water comes 

 in contact, is made of hard phosphor bronze. Except for this hard phosphor 

 bronze, those portions of the aquarium, that come in contact with sea water 

 consist exclusively of reinforced concrete (resp. cements), earthenware, and 

 hard rubber (ebonite). 



The first reserve pumping set, (7, Plan No. 3), is also a Sulzer cen- 

 trifugal pump, with a hard phosphor bronze housing, and is, however, in 

 this case coupled to a benzine motor of approx. l'/2H.P., which can also 

 run at 1450 R.P.M. and is also bolted to a common bed plate. The second 

 reserve pumping set, (8, Plan No. 3,) consists of a hand pump of the Ber- 

 liner Pumpenfabrik A. G., the discharge of which is 1.3 L. per double stroke. 



The capacity of the centrifugal pumps being more than 10 cubic 

 Metres per hour at 1450 R. P. M., it is possible, therefore, to renew the 

 contents of the tanks entirely eleven times in the 24 hours if necessary. 



The sole entrance to the cellar of the aquarium is through a trap 

 door, (9, Plan No. 3), under which is found a stairway. 



1ÏÏC 



ZIW^. 





w:z 



A 



2 



a 



13] 



1 



LOUIS; 



B 



5 



rtp^:rtrr-r:rrrr.:^rppTrr.^- 



iizz: 



3IE 



T 



TE 



EUi 



TV- 



D 



3^_E 



c 



Plan No. 4 Aquarium cellar. 1 = filter tanks; 2 = mixing reservoir; 3 ^^ first 

 southerly large reservoir; 4 ^^ second northerly large reservoir; T = places where 

 earthenware pipes delivering water which has flowed from the tanks to the top edge 

 of the filters, comes out; A, a, B and C, circulating ducts; D --^ place whence the 

 water is pumped up - commencement of the guction pipes. 



Length of the aquarium cellar from East to West = M. 18,30. 



