1 64 Mr. R. Sabine on a New Determination of 



determination, viz. 



C = 



1 + V« + -^r 



va 



in which 



a= —z 



R 2 max. L 



r 2 min. L 



The following Table gives the means of several readings with 

 each length : — 



Table II. 





L 











Number 



















a. 



Mean. 



c. 





Max. 



Min. 











millims. 



millims. 









3 



16-9 



14-1 



1-1986 



1 







25-0 



208 



1-2019 



11-20017 



1-002775 





30-6 



25-5 



1-2000 



J 





5 



200 



18-8 



1-0638 



1 







21-4 



19-9 



10754 



1 1-07073 



1-000393 





29-4 



27-4 



10730 



J 





7 



795 



7-5 



1-0600 



1 







141 

 22-92 



13-43 

 21-82 



1-0499 

 1-0504 



1 1-05325 



1-000224 





30-35 



28-83 



10527 



J 





8 



9-65 



90 



10722 



i 







11-6 



14-65 



10-8 

 13-65 



1-0741 

 10732 



1 1-07282 



1-000412 





37-3 



34-8 



1-0718 



J 





10 



150 



13-6 



11029 



] 







19-9 



18-2 



10934 



1 1-09850 



1-000735 





28-9 



26-3 



1-0989 



J 





11 



14-6 



14-2 



10282 



1 







15-4 



150 



1-0267 



1 1-02823 



1-000065 





24-2 



23-5 



1-0298 



J 





12 



1205 



8-55 



11-5 



8-2 



10478 

 1-0427 



1 1-04525 



1000163 



13 



116 



111 



1 0451 



1 







16-2 



156 



10385 



[ 1-04077 



1-000133 





29-5 



28-4 



1-0387 



J 





14 



17-2 



17-0 



10118 



1 







219 



21-6 



1-0139 



1 1-0119 



1000012 





25-2 



24-95 



1-0100 



J 





15 



161 



150 



1-0733 



1 







250 



23-3 



1-0730 



1 1-07347 



1-000419 





290 



27-0 



10741 



J 





The capacities of the tubes were ascertained by filling them 

 with mercury, which was afterwards weighed. 



In the operation of filling, care was taken to exclude air- 

 bubbles. 



An iron frame (A) was attached to one end of the tube D, as 



