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The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth.

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Summary

Massachusetts 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.

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Tags

massachusetts hoosac tunnel mass tunnels air compressors hurd ward publisher stereoscopic views air compressors power drive drills surface earth united states robert dennis collection of stereoscopic views ultra high resolution high resolution new york public library back of stereoscopic card vintage ads
date_range

Date

1850 - 1930
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Source

New York Public Library
link

Link

https://digitalcollections.nypl.org/
copyright

Copyright info

Creative Commons CC0 1.0 Universal Public Domain Dedication ("CCO 1.0 Dedication")

label_outline Explore Compressors, Drills, Hurd Ward Publisher

Topics

massachusetts hoosac tunnel mass tunnels air compressors hurd ward publisher stereoscopic views air compressors power drive drills surface earth united states robert dennis collection of stereoscopic views ultra high resolution high resolution new york public library back of stereoscopic card vintage ads