Elementary treatise on electricity and magnetism :
An English-language physics textbook on electricity and magnetism by George Carey Foster and Jules Joubert, revised by Alfred W. Porter and issued by Longmans, Green in 1905 for university students. The 175 wood-engraved figures show benchtop apparatus — electroscopes, coils, galvanometers, wire circuits — drawn with hatched shading, letter labels, and loose dotted field lines on plain ground.














































































































































































