Philadelphia Library. Stereoscope card, 19th century Philadelpia PA.

Philadelphia 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 Philadelphia pa Philadelphia-Bibliothek r newell sons fotograf stereoskopische Ansichten Philadelphia Bücherei Vereinigte Staaten Robert Dennis Sammlung von stereoskopischen Ansichten Geschichte von Philadelphia historisches philadelphia ultrahohe Auflösung hohe Auflösung New Yorker öffentliche Bibliothek

1850 - 1930

New York Public Library

https://digitalcollections.nypl.org/

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