impr(yoedSliding-Rod Eudiometer and of the Volumescojje. 1 2 1 



produce an equilibrium. If while the cavity of the receiver is 

 thus m communication with the atmosphere, the cock H be- 



mg sliut, the siiiling-rotl be drawn out 100 degrees rurtlicr, so 

 as to reach to 150 on the scale, 100 meusurcs of air must en- 

 N.S. \ol a. "No.yj. Aug. 1829. It tcr 



