344 ]JIr. R. Sabine on a Method of Measuring 



coming into contact with an anvil in electrical connexion with 

 the support of the lever I, allows the charge of the accumu- 

 lator to leak partially away through m and r until the pointer, 

 i, rotating with the disk, strikes I from m to n, thereby stop- 

 ping further discharge through r, and putting the accumulator 

 to the galvanometer, which indicates the remaining electricity , c. 

 In the experiments which follow, the object was to compare 



the relation of the excursions (-) as observed with the same 



relation calculated by the aid of the formula, on the assumption 

 that the time-intervals as indicated by the index of the pointer 

 on the disk were correct. The same accumulator was used as 

 in the previous experiments. The battery consisted of two 

 LeClanche cells. The galvanometer-coil was shunted by a 

 wire whose multiplying-constant was =3 in reading the ex- 

 cursions due to the initial charges C. 







Excursions of needle 



C 



Interval of 



Discharging 



observed. 



c 





time by in- 

 dex of disk. 



resistance 

 (r). 























C. 



c. 



Observed. 



Calculated. 



second. 



ohms. 



divisions. 



divisions. 







00002 



500 



232x3 



204 



3-41 



3-32 



0-0003 



700 



232x3 



206 



3-38 



362 



00004 



1000 



233x3 



226 



309 



3-32 



00005 



1200 



233x3 



214 



3-27 



3-49 



00006 



1600 



233x3 



228 



306 



3-08 



00007 



1700 



233x3 



210 



3 33 



3-44 



00008 



2000 



234x3 



216 



3-25 



3-32 



00009 



2300 



234x3 



226 



311 



3-23 



0001 



2500 



234x3 



218 



3-22 



3-32 



0002 



5000 



234x3 



224 



313 



3-32 



0003 



7000 



234x3 



216 



3-25 



3-62 



0004 



10000 



235x3 



208 



3-39 



3-32 



0005 



12000 



235x3 



200 



3-52 



3-49 



0006 



14000 



235x3 



198 



3-56 



3-62 



0007 



J7000 



235x3 



206 



3-42 



3-44 



0-008 



20000 



236x3 



210 



3-37 



3-32 



0-009 



23000 



235x3 



212 



3-33 



3 23 



001 . 



25000 



237x3 



215 



331 



3-32 



002 



50000 



236x3 



213 



3-33 



3-32 



0-03 



70000 



233x3 



196 



3-57 



3-62 



004 



100000 



231x3 



208 



3-34 



3-32 



005 



130000 



232x3 



217 



320 



317 



006 



160000 



236x3 



230 



3-08 



3 08 



0-07 



180000 



235x3 



219 



3-22 



3-21 



0-08 



200000 



235x3 



210 



3-36 



3-32 



0-09 



230000 



235x3 



218 



3-24 



3-23 



01 



250000 



234x3 



210 



3-34 



3-32 



It is evident from this Table that the agreement between the 



