Alfred A. Hart
Encyclopedia
Alfred A. Hart was a 19th-century American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 photographer for the Central Pacific Railroad
Central Pacific Railroad
The Central Pacific Railroad is the former name of the railroad network built between California and Utah, USA that formed part of the "First Transcontinental Railroad" in North America. It is now part of the Union Pacific Railroad. Many 19th century national proposals to build a transcontinental...

. Hart was the official photographer of the western half of the first transcontinental railroad, for which he took 364 historic stereoviews
Stereoscopy
Stereoscopy refers to a technique for creating or enhancing the illusion of depth in an image by presenting two offset images separately to the left and right eye of the viewer. Both of these 2-D offset images are then combined in the brain to give the perception of 3-D depth...

 of the railroad construction in the 1860s. Hart sold his negatives to Carleton Watkins
Carleton Watkins
Carleton E. Watkins was a noted 19th century California photographer.Carleton Emmons Watkins was born in Oneonta, upstate New York. He went to San Francisco during the gold rush, arriving in 1851...

, who continued to publish the CPRR stereoviews in the 1870s.

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