490 



DR. C. CHEEE, EXPERIMENTS ON ANEROID BAROMETERS 



TABLE XLTL Ratios of Differences of Descending and Ascending Readings to the 



r 7 __ Q-g'3 



Mean Difference. "0," observed results (1885-91); "C," calculated from | m _ 1<3 ' ' 



By varying I and m one could of course have slightly improved the agreement in 

 individual ranges. 



For instance, the assumption 



I = 078, 



m- 1-07, 



would reduce the mean difference of the observed and calculated values in the 

 range 30-23 to 'Oil, representing '002 inch. 



45. As an example of the calculation of k, we have for the sum of the differences 

 of the descending and ascending readings in the cycle 30-24-30 : 



from mean of aneroids in Table I. (first group) '684 inch, 



from formula k (42m + 91'9 45'5Z). 



