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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details. |
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29th Jul 2021, 6:06 pm | #21 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
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Re: Nernst Lamps
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2nd Aug 2021, 10:36 am | #22 | |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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Re: Nernst Lamps
Quote:
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6th Aug 2021, 8:37 pm | #23 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
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Re: Nernst Lamps
The radioactive ones are still available apparently.
https://www.youtube.com/watch?v=D_qFWoa_HR4
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-- Graham. G3ZVT |
6th Aug 2021, 8:55 pm | #24 |
Nonode
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
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Re: Nernst Lamps
The correct active materials for a replica Nernst lamp should be available from any supplier of lab chemicals.
I presume that the materials would have to be compressed into a dense mass by use of a press. Could the materials be contained in a Pyrex or silica tube ? need not be air tight, the idea being mechanical support not to exclude air. |
6th Aug 2021, 9:23 pm | #25 |
Dekatron
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
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Re: Nernst Lamps
Ordinary glass becomes electrically conductive at red heat: my school physics master demonstrated this by connecting a mains bulb in series with two metal bars held in two retort stands, balanced a glass rod on the bars, and heated the glass with a bunsen burner. As it approached red heat the bulb started to glow and got progressively brighter as the temperature increased. Red hot pyrex might provide a short circuit path across the glower.
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7th Aug 2021, 1:32 am | #26 |
Nonode
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
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Re: Nernst Lamps
Ordinary glass is indeed conductive at red heat, but Pyrex might be OK, And silica should be OK, thinking of silica covered electric fire elements.
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