MacKintosh, William, Esq.2009-07-282009-07-282009-07-28http://hdl.handle.net/10222/12066One letter, two pages ; One letter, three pages.Two letters to James Dinwiddie from William Mackintosh Esq. One letter dated Sept 1782 and one letter, date unknown.enTelescopeChromaticBillMachineMicroscopeWilliam Mackintosh Esq.James Dinwiddie1792PolyopticMirrorsCamera obscuraMahoganyCylindricText