1896.] Scientific Instruments used by the late Dr. Joule. 355 



Sulphuric acid. 



3 

 3 

 3 

 1 

 1 

 1 

 



Water. 

 

 1 

 2 

 1 

 2 

 4 

 1 



Pressure in inches of mercury. 

 Inappreciable. 



O'Ol inch at 70 

 0-03 „ 63 

 0-15 „ 63 

 0'30 „ 55 

 0-37 „ 47 



On examination the india-rubber tubing proved to be quite rotten, 

 and had to be replaced, and also as was stated before, the manometer 

 was missing. 



I did not make any experiment to test the pump, because results at 

 all comparable with those obtained by modern instruments could not 

 be expected from a pump whose joints are made of india-rubber 

 tubing. 



