28 



H. J. THOMAS 



2. Examine sea-water filters, renewing small 

 individual filters as necessary. 



3. Lift covers to dncts in north-block aquarium 

 and hose out ducts. Clear rust from ironwork 

 and touch up. 



4. Clean and grease the refrigerator units 

 (three) and blower motor. 



5. Clean and grease aerator units (three). 



6. Examine all machinery, lighting reflectors, 



conduit switches, etc. for corrosion. Clean off 

 rust and touch up as necessary. 



7. Remove Sunvic thermostats. Clean hous- 

 ings and control unit. Protect the bimetal strips 

 by dipping in light oil. 



Quarterly maintenance 



1. Check air filters (three) for cleanliness; 

 renew as necessary. 



qiass panels 



seawater 



return 



removable 

 cover sections 



'"qrouncJ 

 level 



air- 

 line 



^< 



removable 

 partition 



aeration atomizer 



overflow pipe to 

 air lift system 



Figure 7. — Isolated experimental tanks. The covers to tank 1 and its associated filter unit, as well 

 as the access cover to the inspection pit for the air lift, are removed. The sectional teak parti- 

 tion used to divide the tank is shown dotted in position, as also are the internal aeration piiies 

 and atomizers. 



