Externally, the jollity of aged men has much in common with the mirth of children; the intellect, any more than a deep sense of humour, has little to do with the matter; it is, with both, a gleam that plays upon the surface, and imparts a sunny and cheery aspect alike to the green branch and grey, mouldering trunk.
1) Knob and tube wiring is two-stranded â with a hot wire and a neutral wire only â it uses no ground wire. There is absolutely no protection whatsoever when a fault occurs.
Left: Photo of display of knob and tube wiring at the Edison Tech Center. Some historical houses still have knob and tube wiring in use after over 100 years. Flexible wire insulation. Over the years wire insulation changed from rubber to complex polymers.