Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,683 pages of information and 247,074 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
Presumably a successor in some way to Porter Clark Water-Softening Co
1921 Porter's patent densimeter described by W. H. Porter.[1]
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MW1.43