1915] Michael, ct al.: Hijdrograpliic Recorch of Scripps In.<:fittiiion 15 



Degrees C to be Corresponding 



subtracted depth 



from reading in meters 



0.00-0.05 C 0- 25 



0.10 *. 30 



0.15 32 



0.20 34 



0.25 36 



0.30 40 



0.35 46 



0.40 57 



0.45 72 



0.50 87 



0.55 103 



0.60 120 



0.65 138 



0.70 156 



0.75 174 



O.SO 193 



0.85 216 



0.90 247 



0.95 300 



1.00 350 



After this correction has been applied, the temperature may be 

 eon-sidered accurate to within 0?2 C providing the temperature of the 

 water in the lowest part of the bottle is taken. As stated above, this 

 has always been done since 1908. 



Since July 16, 1910, most all sub-surface samples were collected 

 with the Elanan bottles (see p. 12) and the temperatures were meas- 

 ured with the Richter reversing thermometers, two usually having 

 been attached to each bottle. 



The Richter thermometer in reality consists of two tliermometers. 

 r and a, fastened together and hermetically sealed in a hea\'y glass 

 tube, thereby preventing the mercury bulbs from being affected by 

 the water pressure. In one of the thermometers, r, the capillary tube 

 is contracted just above the large bulb, B, so that, when inverted, the 

 column of mercury in the stem breaks at this contraction, c, and, 

 dropping, fills a smaller bulb, h. and a portion of the stem. The actual 

 volume of mercury thus In-oken off depends upon the temperature at 

 the depth of reversal, and the scale while arranged with the lowest 

 values at the small bulb, b, is graduated with respect to the large bulb, 

 B, so that a direct reading is possible only when the thermometer is 

 read at exactly the same temperature as that at the depth of revereal. 

 Since this condition is seldom if ever realized, the reading must be 



