SPECIFIC VOLUME AND DENSITY OF ATMOSPHERIC AIR AND SEA-WATER. 



35 



limited to the pressure of 500 d-bars, while the temperature must have all values 

 from the freezing-point of water to that of the tropic sea, and the salinity all values 

 from that of fresh water to that of oceanic water. These tables could be used for 

 the Baltic, the St. Lawrence Bay, the mouths of great rivers, the shallow waters 

 along the Arctic coasts, etc. The variations of the independent variables being 

 limited in this way, the tables could be constructed for so small intervals of the 

 independent variables that convenient differences would be obtained even if the 

 specific volume was calculated with six decimals. 



28. Control of the Accuracy of the Tables. A question of the highest 

 importance is that of the absolute reliability of the tables. The test is given in as 

 direct form as possible by the annexed tables B and C. The first table contains 

 the volumes of the samples of sea-water under atmospheric pressure examined by 

 Martin Knudsen. These volumes are not given in absolute measure in Martin 

 Knudsen's paper, but by the additional data they have been reduced from the rela- 

 tive measure employed in the course of the experiments to the values in absolute 

 units given in table B. In the same manner table C contains the specific volumes 

 of the samples of sea- water under different pressures examined by Ekman. These 



Table B. Fundamental Values a s ,T,o of Specific Volume of Sea- Water under Atmospheric Pressure. 



