376 H. 8. Carhart—Electromotive Force of a Daniell Cell, 
| TABLE. 
Per_| Temp. |Resis.in! _ Silve Product of |Corrected for) | Mean E. M. F, 
ZnSO, |Rreostat| Watts. depcaied 1a Seeimance | temp ot | Wate | ata 
o | 20° | 11 | 6v27mgs| 73-997 | 73-997 | 173997 
1 | 188] 11 | 7277 “| 80-037 | 80-000 | 80-000 | 1126 
84] jos} 12 |,e710 “| g0320 | sosoa jf 87884 | 1193 
Dee secre tetach Gh pss |: shes | L126 | 1142 
ee a tk tence |. none | 79620 | 1120 
Sr ad eae el eee vena: |t Toremor | ae 
oe i Maen ih ep henatia bdreedma a ad a 
Wr sare ak | toery fb agaee |b 19-008 | ita 
(oO aN 6 a ae 
Mean, 1°122 
The ratio of the Siemens unit to the congress or legal ohm 
is 100 to 106, or, 50 to 58. According to Lord Rayleigh a 
current of one ampére pai 4-025 gms. of silver in an hour, 
or 67°08 mgs. a minute. Therefore if C, R and E represent 
current strength, resistance, and electromotive force in ampéres, 
ohms, and volts, and e the electromotive foree in the arbitrary 
unit of the table, we have the following equation, 
53 g 
(R. =) (Cx 67-08) =e; 
: whence R C= == 
ri = X67 08 
It is only necessary then to aun the quantities in column 
seven by 71°105 to reduce them to volts. 
The method employed is amply sustained by the results 
obtained with a Latimer Clark standard cell. Two trials gave 
the same result. I give only one of them. 
‘LiIN@ Of GEDUNIUION OF SUVET,. i... wc. a hoe Lee 
Resistance between C and D, 
Tempers ature WE PONT, Ss is oe es 
Clark’s cell, : 
Weight of silver cup after deposition, poe ade 
befor 
18° 
26°1963 gms 
26°14538 
Silver deposited in spon min., APigir Ase oibig Ok eee 0°051 “ 
bc See Rh Ueda See ee 5°] =mgs. 
5:1 sia gulag 102+71°105=1°434=E. 
