File:Detail of insulator array at H-frame structure on Ryan-to-Rainbow Line 1 about three miles southwest of Ryan Dam. Array has one historic porcelain suspension insulator and two non HAER MT-98-C-6.tif

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Summary[edit]

Photographer
Hager, Kristi
Title
Detail of insulator array at H-frame structure on Ryan-to-Rainbow Line 1 about three miles southwest of Ryan Dam. Array has one historic porcelain suspension insulator and two non-ceramic insulators - Ryan Hydroelectric Facility, Ryan-to-Rainbow 100 kV Transmission Line, West bank of Missouri River, northeast of Great Falls, Great Falls, Cascade County, MT
Depicted place Montana; Cascade County; Great Falls
Date 2006
Dimensions 4 x 5 in.
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER MT-98-C-6
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Notes
  • Significance: The transmission line is an early and well preserved example of an important innovation in electric power transmission line technology, the H-frame support structure. Comprised of two-wood poles connected by a cross-arm(s), the H-frame offered a viable and comparatively economical means for the construction of transmission lines of over 66,000 volts. It became the standard for high voltage line construction following its introduction in the mid-1910s, and remained so for decades.
  • Survey number: HAER MT-98-C
  • Building/structure dates: 1915 Initial Construction
Source https://www.loc.gov/pictures/item/mt0483.photos.364081p
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
Object location47° 30′ 01.01″ N, 111° 18′ 00″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current20:47, 28 July 2014Thumbnail for version as of 20:47, 28 July 20145,288 × 4,266 (21.52 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 24 July 2014 (2001:2300)

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