Palmer — Pressure Coefficient of Mercury Resistance. 9 



obtained after the apparatus had been left sustaining a pressure 

 of about 750 atmospheres for two hours and lies below the 

 line, while the second, obtained after rapidly increasing the 

 pressure from one to 1640 atmospheres, lies above it. Similar 





















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operations at another time failed to produce similar results and 

 an entirely satisfactory explanation does not present itself, but 

 it is probable that the first is due largely to imperfect freedom 

 of the gauge pistons, caused by particles of dirt in the oil leak- 

 ing past them, and the second to the heat produced by rapid 

 compression. 



Brown University, March 18, 1897. 



