2^ DISCOVERY REPORTS 



SUMMARY 



1 . Observations over many years leave little doubt that deep-sea reversing thermometers, both of 

 the protected and unprotected types, remain, with few exceptions, very reliable. 



2. Failures to show an accurate temperature are few, only 447 being noted out of a total of 21,858 

 observations. 



3. It is suggested that the reason for one type of erratic behaviour, hitherto not understood, may 

 be due to some temporary physical change in the glass. 



4. There is little difficulty in the field in reading temperatures to ±o-oi° C. 



5. The use of a series of unprotected reversing thermometers on a cast of water-bottles to measure 

 the depth at which the bottles closed will record these depths within a limit of approximately ± 1 m. 

 for each 1000 m. of depth. 



This paper has been read in manuscript by Dr G. E. R. Deacon, C.B.E., F.R.S., and Dr N. A. 

 Mackintosh, C.B.E.; to them we are indebted for encouragement and advice. We should also like to 

 thank Mr R. Harrison, lately of Messrs Negretti and Zambra, for his valuable help in respect of some 

 of the technical aspects of the manufacture of deep-sea thermometers. 



Mention should also be made of the valuable work of the late Mr J. G. Durham of the N.P.L., who 

 for many years calibrated and re-calibrated a large proportion of the deep-sea thermometers now 

 under review. 



REFERENCES 



SvERDRUP, H. v., Fleming, J. A., Soule, F. M. and Ennis, C. C, 1944. Scientific Results of Cruise V 11 of the 'Carnegie' 

 during ig28-ig2g. Oceanography — i-A, Observations and Results in Physical Oceanography, 1-156. 



Whitney, G. C, Jr. 1952. Notes on Malfunctional Behaviour and its Correction in Deep-Sea Reversing Thermometers. 

 Rep. no. 52-29. Woods Hole Oceanographic Institution (unpublished manuscript). 



1955- A Note on Non-linear Behaviour of Unprotected Reversing Thermometers. Ref. 55-62, Wood's Hole Oceanographic 



Institution (unpubUshed manuscript). 



WiJST, G., 1932. Thermometrische Tiefenmessung. Wiss. Ergebn. dtsch. atlant. Exped. 'Meteor', iv (i), 60-177. 



