ELECTRICAL UNITS OF MEASUREMENT. 85 



unit, first called the British Association unit, and 

 afterwards the ohm ; of which the resistance 

 reckoned in electro-magnetic measure was to 

 be, as nearly as possible, 10,000 kilometres per 

 second. 



In regard to the name of " ohm," I may mention 

 that a paper was communicated to the British 

 Association in 1861 by Sir Charles Bright and 

 Mr. Latimer Clark, in which the names that we 

 now have, with some slight differences, were 

 suggested ; and a complete continuous system 

 of measurement was proposed, which did not 

 fulfil certainly all the conditions of the absolute 

 system, but which fulfilled some of them in an 

 exceedingly useful manner for practical purposes. 

 To Sir Charles Bright and Mr. Latimer Clark, 

 therefore, is due the whole system of names as 

 we have it now, ohms, volts, farads, and micro- 

 farads. From 1870 or 1871 forward, the absolute 

 system, with the approach to accurate realisation 

 of it given by the British Association unit, has 

 been in general use in England and America ; 

 but another decade has passed, a rather long one, 



