Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,716 pages of information and 247,105 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.
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[[W. H. Porter]].<ref>The Engineer 1921/02/25</ref> | 1921 Porter's patent densimeter described by [[W. H. Porter]].<ref>The Engineer 1921/02/25</ref> | ||
== See Also == | == See Also == | ||
1921 Porter's patent densimeter described by W. H. Porter.[1]
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