544 Prof. F. Rosett-i's Experimental Researches 



E. 



q observed. 



q calculated. 



Difference. 



1-8 



200-9 







24 



1798 



18397 



+4-17 



30 



166-6 



16941 



+281 



3-6 



156 1 



156-79 



+061 



3-9 



151-1 







4-2 



1461 



1457 



-0 32 



4-8 



1372 



1361 



-11 



5-4 



128-2 



12758 



-0-62 



60 



1200 



1 





The great differences 'which the calculated values exhibit in 

 proximity to e = l*8 show that the calculated value of a which 

 corresponds to e = is much less than the true value. Conse- 

 quently I have been obliged to abandon all hope of making 

 use of a formula which is only empirical, and content myself 

 with dividing the curve into a certain number of parts, and 

 applying to each portion an equation of the form of q = ab e , cal- 

 culating each time the value of the constants a and b. Natu- 

 rally we thus obtain for each day of observation a series of 

 different values for a and another for b. It may be useful to 

 give a Table of the results obtained by applying this method 

 to the observations of several days. 







Values obtained by- 





Date. 



Interval between 

 e. 



formula. 



Mean value 

 of e. 



a. 



b. 





fl-4 and 2-0 



273-68 



0-83533 



17 



Sept. 28 



I 20 „ 2-6 



270-49 



0-84080 



23 





j 2-6 „ 3-2 



250-79 



0-86557 



29 





^3-2 „ 5-0 



227-71 



089954 



41 





fl'4 „ 20 



272-3 



0-82173 



1-7 





| 20 „ 2-6 



26375 



0-8371 



2-3 



Sept. 29 



\ 2-6 „ 3-2 



j 3-2 „ 4-4 



237- 17 



0-8721 



2-9 





210-24 



0-9054 



3-8 





14-4 „ 7-0 



196 33 



0-909 



5-7 





ri-5 „ 21 



271-96 



0-77931 



1-8 



Oct. 3 



J 2-1 „ 2-7 



240-92 



0-8256 



2-4 





1 2 7 „ 33 



234-20 



0-8342 



3 





[3-3 „ 3-9 



20655 



0-8667 



3-6 





H-8 „ 2-4 

 1 2 4 „ 30 



280-25 



0-8312 



21 





243-9 



0-8807 



2-7 



Oct. 21 



J 30 „ 3-6 

 j 3-6 „ 4-2 



230-7 



0-8972 



3-3 





232-2 



0-8955 



3-9 





I 4-2 „ 4-8 



226-8 



0-900 



45 





U'8 » 5-4 



234-6 



0-894 



51 





fW „ 2-3 



251-20 



0-8212 



20 



Oct. 14 



I 2-3 „ 2-9 



23308 



0-8484 



26 





1 29 „ 3-5 



217-49 



0-8689 



3-2 





13-5 „ 7-74 



222-25 



0-8635 



5-6 



Dec. 17 



/2-7 „ 3-3 



262-7 



0-869 



30 





1 33 „ 3-9 



245-9 



0887 



3-6 





f'2-7 „ 3-3 



245-8 



0-8575 



30 





| 3-3 „ 3-9 



2209 



0-8856 



36 



Dec. 22 



«{ 3 9 „ 4-5 



|4-5 „ 51 



212-7 

 213.2 



0-8943 

 0-8938 



4-2 



4-8 







15-1 „ 5-7 



2127 



0-8943 



54 



