File:Telephone switchboard cross-switching (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg

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Original file ‎(553 × 712 pixels, file size: 45 KB, MIME type: image/jpeg)

Summary

This is in fact a manual crossbar. It has the capacity of four subscriber lines (top) and four horizontal talking paths (albeit not needed for four subscribers). The fifth crossbar is the operator circuit, and at the bottom is the ground bar for enabling the signal indicators for idle subscribers.

Copyright status:

public domain

Source:

Scan from Kennedy, Rankin (1903 edition (five volumes) of pre-1903 four volume edition.) Electrical Installations, vol. V, London: Caxton

File history

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Date/TimeThumbnailDimensionsUserComment
current04:01, 31 July 2021Thumbnail for version as of 04:01, 31 July 2021553 × 712 (45 KB)Thales (talk | contribs)This is in fact a manual crossbar. It has the capacity of four subscriber lines (top) and four horizontal talking paths (albeit not needed for four subscribers). The fifth crossbar is the operator circuit, and at the bottom is the ground bar for enabli...
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