112 



DAVID G. CARGO 



Polyethylene piping, fittings: American Hard 

 Rubber Co., Butler, N.J. 



Polyethylene piping: Sears, Roebucli & Co., 

 Philadelphia, Pa. 



Polyethylene piping and fittings : Yardley Plas- 

 tics, Columbus, Ohio. 



Vinyl and polyethylene tubing and containers : 

 Phipps & Bird, Inc., Richmond, Va. 



Epoxy-base paint : Pettit Paint Co., Belleville, 

 N.J. 



Black asphaltum varnish : Devoe & Raynolds 

 Co., New York, N.Y. 



Pressure switches : Barksdale Valves, Los An- 

 geles 58, Calif. 



Stainless-steel pipe clamps : Murray Co., Tow- 

 son, Md. 



SUMMARY 



The two systems for supplying salt wa- 

 ter for the Chesapeake Biological Labora- 

 tory at Solomons are essentially metal- 

 free, continuous-running systems. One 

 provides 80 gallons per minute through a 

 centrifugal pump, the other 25 gallons 

 per minute through a progressing cavity 

 pump at a low pressure. The first is a 



straight-through, positive-pressure unit of 

 simple design. The second is more com- 

 plicated, with a novel and efficient distri- 

 bution system. 



Both of these systems have their advan- 

 tages and disadvantages but present ex- 

 perience indicates that an increased effi- 

 ciency and utility will be realized in the 

 future as our familiarity with these units 

 is improved. 



REFERENCES 



MacGinitie, G. E. 

 1947. Sea water systems at Marine Labora- 

 tories. Science, vol. 106, No. 2747, pp. 171- 

 173. 

 Mairs, Donald F. 



1961. Toxicity of an epoxy cement to fishes. 

 Progressive Fish-Culturist, vol 23, No. 4, p. 

 178. 

 TowNSEND, Charles Haskins. 



1928. The public aquarium ; its construction, 

 equipment, and management. U.S. Bureau 

 of Fisheries, Report of the U.S. Commis- 

 sioner of Fisheries for 1928 (Appendix VII), 

 pp. 249-337. 



