LABORATORY-LIKE CONDITIONS 



Tower facilities duplicate in many 

 respects those found in the laboratory, 

 and therefore permit a wide spectrum of 

 controlled studies. 



Because of the absence of motion, 

 sensitive instruments such as resonant 

 cavity chambers, microscopes, and 

 other optical equipment can be operated. 

 Acoustic studies benefit from the low 

 underwater ambient noise level and from 

 the low self-noise level. There is neither 

 generator noise nor electrical interfer- 

 ence because power is supplied from 

 shore. Other laboratory-like conditions 

 are: the ability to maintain nearly con- 

 stant room temperature; the convenient 

 access to compressed-air and constant- 

 vacuum systems; the stable power sup- 

 ply (voltage, frequency) , which permits 

 operation of recording equipment at con- 

 stant speeds and known outputs; and the 

 ready availability of a wide variety of 

 measurement and test instruments. 



Filtering microorganisms from freshly collected 

 sea-water samples, through millipore filters, under 

 conditions of constant vacuum. 



Subjecting planktonic organisms to magnetic 

 fields. 



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