HYDROGRAPHIC TABLES. 



3lA 



Table 23 H (continued). Inversion table, to pass from density to specific volumes, and vice versa. 



Example I : Given density 1.02742 Example 2 : Given specific volume 0.96S57 



The table gives specific volume o-9733i The table gives the density 1.03245 



Special Application. Change of charts of mutual topography of isobaric surfaces (/. c, charts of specific 

 volume in isobaric sheets) into charts of pressure differences between corresponding level surfaces (. e., density in 

 corresponding level sheets). 



Example 1 : Given the chart of mutual topography of the isobaric surfaces of 5 and 6 d-bars sea-pressure. 

 Required the chart of pressure differences between the level surfaces of 5 and 6 dynamic meters of depth. The 

 table shows the curve of pressure difference 1.0120 d-bars to coincide with the 0.98814 dynamic meters curve, the 

 curve of pressure difference 1.0121 d-bars to coincide with the 0.9SS04 dynamic meters curve, etc. 



Example 2 : Given the chart of mutual topography of the isobaric surfaces of 50 and 60 d-bars sea-pressure. 

 Required the chart of pressure differences between the level surfaces of 50 and 60 dynamic meters depth. The 

 decimal in the table is displaced one step to the right. The table, then, shows the curve of pressure difference 

 10.120 d-bars to coincide with the 9.8814 dynamic meters curve, the curve of pressure difference 10.121 d-bars to 

 coincide with the 9.SS04 dynamic meters curve, etc. 



Example 3 : Given the chart of mutual topography of the isobaric surfaces of 500 and 600 d-bars sea-pressure. 

 Required the chart of pressure differences between the level surfaces of 500 and.600 dynamic meters depth. The 

 decimal in the table is displaced two steps to the right. The table then shows the curve of pressure difference 

 101.20 d-bars to coincide with the 98.814 dynamic meters curve, the curve of pressure difference 101.21 d-bars to 

 coincide with the 98.S04 dynamic meters curve, etc. 



Displacing the decimal three steps the table may be used in the same way for the case of isobaric sheets of 1000 

 d-bars and the corresponding level sheets of 1000 dynamic meters. 



