53 



It affords me much satisfaction in looking back upon this 

 active period, when there was necessarily much discussion and 

 difference of opinion, to reflect that I cannot recall a single 

 instance of an unkind word given or received, and that some of 

 those with whom I had the keenest controversy were after- 

 wards the most marked in their demonstrations of friendship. 



[Reference may be made to an article in The Times, of June 

 13, 1882, page 4, by the author of the present paper, for an 

 account of the various kinds of magneto and dynamo machines.] 



Resolutions adopted by the International Congress of Elec- 

 tricians at the sittting of September zmd, 1881. 



1. For electrical measurements, the fundamental units, the 

 centimetre for length, the gramme for mass, and the second 

 for time, are adopted. 



2. The Ohm and the Volt (for practical measures of resistance 

 and of electromotive force or potential) are to keep their existing 

 definitions, io° for the Ohm, and io 8 for the Volt. 



3. The Ohm is to be represented by a column of mercury of 

 a square millimetre section at the temperature of zero centi- 

 grade. 



4. An International commission is to be appoined to deter- 

 mine, for practical purposes, by fresh experiments, the length 

 of a column of mercury of a square millimetre section which is 

 to represent the Ohm. 



5. The current produced by a Volt through an Ohm is to be 

 called an Ampere. 



6. The quantity of electricity given by an Ampere in a second 

 is to be called a Coulomb. 



7. The capacity defined by the condition that a Coulomb 

 charges it to the potential of a Volt is to be called a Farad. 



