Hello All:

     Sometime about 1780, Ben Franklin wrote a letter to a George Whatley,
     a Philadelphia optician, explaining to him how he had invented bifocal
     spectacles.

     I would like to obtain a photograpoh of this letter for an exhibition
     I am working on. Does any one out there have any idea who now
     possesses this letter?  Any leads will be greatly appreciated.

     Thanks.

     John Handley
     Museum of Ophthalmology
     San Francisco
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