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 Charles F. Helffricht 1816-1863 Philadelphia, Pennsylvania 
 "Charles F. Helffricht was born in Germany in 1816. He died June 6, 1863 in Philadelphia. He is first listed in the Philadelphia directories: 1841, Helffricht, Charles F. math inst makr 54 Vine; 1849-1857, Helffricht, C. F. math inst mkr 122 S Front h 60 Vine; 1859, Helffricht, Charles F. alderman 140 S. 6th h 240 S. Front." 
 Charles' older brother William Helffricht was also an instrument maker. 
 Reference: Smart, Charles E. The Makers Of Surveying Instruments In America Since 1700 Troy, New York: Regal Art Press. 1962 
 
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