Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The aim is not to explain what electricity is, or what it is not, but to give a working foundation to students whose hope is to become practical men. The difficulty has been in a little work of the kind intended for beginners and beginners only, to decide what should go in and what should be left out. It may serve as an introductory study to the writings of Hopkinson, Kapp, Thompson, and other specialists.