1 70 Mr. R. Sabine on a New Determination of 



The proportion of the balanced system was therefore 

 a __ A + w 



in which equation Wj represents the calculated real resistance of 

 the tube with which x is compared, and w the resistance of the 

 connecting wires on each side = 0*37 millim. The effect of 

 variations of temperature on the connexions may, without sen- 

 sible error, be disregarded. 



A mercury commutator (U) between the tubes and the mea- 

 suring-wire facilitated the inversion of the former for reading off 

 the values of a and b from the same end. 



The tubes were refilled between each measurement. 



The following triangular Table gives the readings of the nonius 

 and the metre scale when the tubes at the heads of the columns 

 were compared with those in the first column : — 



Table VI. — Readings of the Bridge "Wire. 



No. of 



7 





tube. 



i ft 



b. 









424-4 

 424-4 

 424-4 



575-8 



575-75 



575-7 



8 





Mean J 424-4 



575-75 



a. 



b. 







10 



554-65 



554-6 



554-65 



445-75 

 445-75 

 445-75 



627-8 

 627-8 

 627-8 



371-9 

 372-0 

 37195 



10 





Mean. 1 554-63 



445-75 



627-8 



371-95 



a. 



1. 







12 



53705 

 537-05 

 537-1 



462-8 

 4627 

 462-75 



611-55 

 611-55 

 611-55 



388-4 

 388-5 

 388-45 



482-5 

 482 55 

 482-55 



517-35 



517-40 12 



517-35] 





Mean.| 53707 



462-75 



611-55 



388-45 



482-53 



517-37 a. 



b. 







13 1 539-4 

 539-4 

 539-4 



460-2 



460-25 



460-15 



613-85 



613-8 



613-85 



386-15 



386-1 



386-15 



484-8 

 484-7 



484-75 



51475 502 3 

 5147 (502-3 

 5147 502-3 



4975 

 4975 



497-5 



13 





Mean. 



539-4 



460-2 



613-83 



38613 



48475 



51472 502-3 



497-5 



a. 



b. 



14 



574-65 

 57465 

 574-65 



425-4 

 425-4 

 425-4 



646-45 

 646-45 



352-85 

 352-85 



520-6 



520-65 



520-65 



479-5 

 479-5 

 479-4 



537-8 



537-85 



537-75 



461-95 



4620 



462-05 



535-4 

 535-5 

 535-45 



464-5 

 464-4 

 464-5 



14 



Mean. 



574-65 



425-4 



646-45 



35285 



520-63 



479-47 ( 5378 



4620 



535-45 



464-47 



a. 



b. 



15 



556-8 

 556-9 

 556-9 



442-8 

 442-8 

 442-9 



630-4 

 630-45 



369-45 

 369-45 



50255 

 502-45 

 502-55 



497-35 520-1 

 497-30 520-0 

 497 35 519-8 



479-9 

 479-9 

 4800 



517-65 

 51770 

 5177 



482-35 

 482-3 



482-2 



482-0 

 4821 

 482-1 



517-9 

 517-9 

 518-0 



Mean. 



556-8/ 



442-83 



630-42 



369-45 



502-52 



49733 519 97 



47993 



517-68 



482-28 482-07 



517-93 



