7,V TROD U(. 'TION. V 



is of the author's own manufacture, constructed in 

 strict accordance with electric principles, verified by 

 his own experiments. 



While humbly following the great pioneers in 

 electric science, who have hewed waymarks on the 

 rocks, the author will rest content if he has left some 

 foot-prints on the sands, which may serve to guide the 

 wayfarer till obliterated by the coming waves of 

 progress. 



The impartial criticism of teachers and electricians 

 is especially requested, that faults and errors may be 

 corrected in future editions. 



PHILIP ATKINSON. 



CHICAGO, June, 1886. 



