ELECTRICAL MEASUREMENT. 



[Address before Section of Mechanics at the Conferences 

 held in connection with the Special Loan Collection of 

 Scientific Apparatus at the South Kensington Museum, 

 May \-jth, 1876.] 



THE beginnings of electrical measurements, are, 

 I believe, the measurements of Robinson in 

 Edinburgh, and of Coulomb in Paris of electro- 

 static forces. The great results which followed 

 from those measurements illustrated how im- 

 portant is accurate measurement in promoting 

 thorough scientific knowledge in any branch of 

 physical science. The earlier electricians merely 

 describe phenomena attractions and repulsions 

 and flashes and sparks and the nearest approach 

 to measurement which they gave us, was the 

 length of the spark under certain circumstances ; 



