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| CDV image of famed American optician, Charles C. Harrison 
 Image from the Nelson and Roswell Moore Studio
 
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| Image Courtesy of Brad Townsend at www.bwtownsend.com |  | 
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| Image Courtesy of Brad Townsend at www.bwtownsend.com |  | 
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| The Harrison & Schnitzer Globe Lens  
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| British Patent for the Globe Lens - 1860 |  | 
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 Annual Report of the American Institute of the City of New York For the Years 1863, 1864.
 Albany. Comstock and Cassidy, Printers 1864.
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| 1865 Advertisement for Globe Lenses |  | 
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| Photographic Optics By Désiré van MonckhovenLondon; 1867
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