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Darling & Schwartz of Bangor, Maine, USA
Makers of high quality tools. Typically, their tools were etched or stamped D. & S.
1852 Samuel Darling invented a graduating engine and began the manufacture of rules and squares at Bangor. His first partner was Edward H Bailey, but after a year he formed a new partnership with Michael Schwartz, a saw maker and hardware dealer of Bangor.
1862: At the 1862 London International Exhibition, Darling & Schwartz of Bangor, Maine, showed measuring instruments in the category 'USA Class XIII - Philosophical Instruments &c', for which they were awarded a bronze medal, 'For the excellence and accuracy of the manufacture of their steel scales, and straight edges'. The medal is now in the possession of the Rhode Island Historical Society.
The caliper gauge shown in the photo above is one of only two known to exist, one being 6" long and the other 18". Both turned up in England in recent years. Is it possible that they were two of the 1862 exhibits? If so, is there a third, 12" example?
1866 Darling and Schwartz formed a partnership with competitors Brown and Sharpe.
The partnership continued as Darling, Brown & Sharpe until 1892, when Darling's interests were bought out