Figure 2. Fantail of USS MARYSVILLE and NEL Thermistor Chain and chain hoist. 



depressing weight attached to the bottom of the chain. One link 

 below the deepest temperature sensor and two links above the 

 depressing weight is mounted a Bourdon pressure transducer that 

 provides a measurement of the maximum depth of observation. 

 The interpolated whole-degree-isotherm depths for each 12- 

 second scan are printed in analog form on a 19-inch-wide tape. 

 On more recent cruises the temperature data have been simul- 

 taneously punched on paper tape and recorded on magnetic tape 

 in digital form. A single scan of the temperature-depth record- 

 ings of the chain is equivalent to one bathythermograph (BT) 

 every 12 seconds, or every 120 feet for the normal towing speed 

 of 6 knots. 



10 



