Hydrography of the Stream 



59 



geostrophic velocities, but the data are too irregularly spaced for quanti- 

 tative comparison. Future survey work will, it is hoped, make possible 

 such comparisons. 



PROBLEMS OF CONTOURING 



Problems of contouring are encountered in two ways: (i) in the con- 

 struction of vertical temperature and salinity sections; and (ii) in the 



Fig. 36, a and b. Different ways of contouring a property the distribution of 

 which is measured only along the vertical dashed lines. See text. 



construction of charts showing horizontal distributions. There is never any 

 difficulty in drawing isotherms in a vertical section, for example, when the 

 temperature is a monotonic function of depth, but when the temperature 

 passes through some maxima and minima, the interpretation is ambiguous. 

 Fig. 36 illustrates how a single set of data can be interpreted by contouring 



