Bradford Darby & Hulls, shelf edge hydrostatic steelya
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Bradford Darby & Hulls, shelf edge hydrostatic steelyard, patent No.686 of Dec. 1753, with two sets of fulcrum pins, within a cap end pressed cardboard box, stamped with initials 'R.D', with two sliding poises, beam 17.2cm Jonathan Hulls, yeoman and inventor, and William Bradford, mathematics teacher and surveyor, of Chipping Campden took out the patent. Richard Darby was the maker (working 1753-1773).
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Bradford Darby & Hulls, shelf edge hydrostatic steelya
Estimate £100 - £150
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