MAGNETIC TELEGRAPH. 11 



scious that the twin thought had been born in the 

 brain of the other. 



To those devoted friends and admirers of Fara- 

 day, who delight in singing his well-earned praises, 

 and who best comprehend his achievements, it 

 seems that his discovery that electricity might 

 be produced from magnetism was his grandest 

 result. Upon it depends many of the most 

 important applications of electricity to the uses 

 of man ; and in the near future many more 

 are coming. Tyndall, the successor of Faraday, 

 does not restrain his enthusiasm when he contem- 

 plates this achievement. " I cannot help think- 

 " ing, "says he, "while I dwell upon them, that 

 " this discovery of magneto-electricity is the 

 " greatest experimental result ever obtained by 

 " an investigator. It is the Mont Blanc of Far- 

 " aday's own achievements. He always worked 

 " at great elevations, but higher than this he never 

 "subsequently attained."* 



Let us accept the standard, and apply it to 

 Henry; let the achievement measure the power 

 of the man. 



In November, 1831, Faraday read before the 

 Eoyal Society his memorable paper "On the 

 Evolution of Electricity from Magnetism," 

 illustrated by drawings of the apparatus, in 

 which Figure 1 is the compound "spool," dis- 



* See Appendix, Note A. 



