Go back to article: The life and material culture of Hertha Marks Ayrton (1854–1923): suffragette, physicist, mathematician and inventor

Figure 3

Pen and ink illustration of a draftmans dividing instrument

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Cover page of US Patent 310,450 'Draftsman’s Dividing Instrument', filed on 3 May 1884 and granted on 6 January 1885

DOI: http://dx.doi.org/10.15180/181002/010