26 Apr
2011
26 Apr
'11
2:49 p.m.
On 26 Apr 2011 at 15:40, Diane Bruce wrote:
On Tue, Apr 26, 2011 at 08:17:26PM +0100, Tony Duell
wrote:
It was common knowledge in the 1930s. I have a "Radio Engineering"
handbook from the late 30s that shows the consutruction of an audio
signal generator using a common panel lamp for temperature
compensation.
--Chuck
>
...
> The reason is quite
simple--tungsten-filament lamps (not that I
> expect anyone to have any carbon-filament ones) have a very steep
> resistance-temperature curve (higher "hot" resistance).
HP remembered this.