An example of early knob and tube wiring. The function of a ceramic tube was to carry wire through wood joists, protecting the wire from rubbing the wood or being compressed by it.
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{{Information |Description=An example of early knob and tube wiring. The function of a ceramic tube was to carry wire through wood joists, protecting the wire from rubbing the wood or being compressed by it. |Source=me |Date=5 June 2006 |Author=me |Permi