Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,348 pages of information and 230,027 images on early companies, their products and the people who designed and built them.
Alfred H. Avery
Electrical Consultant at A. H. Avery.
Technical Correspondent to principal weekly electrical journals.
Specialist in fractional horsepower motors and generators.
Author of many practical handbooks on Electrical Apparatus.