Lens-Work for Amateurs e-bog

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. Knowledge will supersede many hours of careful and Often wasted labour. But I have endeavoured to make my practical instructions as plain as possible, and to adapt them to the requirements of young workmen as well as amateurs, and hope that they may serve as.