Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card.

Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembled it over a period of more than six decades, Robert N. Dennis (1900-1983).

Stereographs consist of two nearly identical photographs or photomechanical prints, paired to produce the illusion of a single three-dimensional image, usually when viewed through a stereoscope. Stereographs were produced from the 1850s to the 1940s, with the bulk between 1870 and 1920.

pennsylvania mauch chunk pa inclined planes jefferson plane high resolution gates g f george f photographer stereoscopic views jefferson plane united states mauch chunk robert dennis collection of stereoscopic views 19th century history of pennsylvania new york public library back of stereoscopic card

1858 - 1900

New York Public Library

http://digitalcollections.nypl.org/

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