Mechanical Science. \ 



193 



The members of the committee remark, that they could find 

 only one English table of the force of high pressure vapour; it 

 had been given to M. Clement by Mr. Peri<ins, but it was found 

 sadly erroneous: for instance, at the temperature of 215° C , or 

 419° F., the force in it is given as 35 atmospheres, whereas it is 

 really only 20, or little more than one half. In Germany a table 

 has been constructed by M. Arzberger, of Vienna, which rises to 

 20 atmospheres, and is much nearer the truth than Mr. Perkins. 



JAN.— MARCH, 1830. O 



