Thermocouple Meter

[Skywave]

When I find 5 minutes, I'll make a plot of current through the meter versus meter scale indication. That should me give a starting point to discovering the required law to linearise the scale. Having said that, I can think of applications where a non-linear scale would not be a hindrance - such as this meter's original application, or even as an S-meter.
All hinges on what the law turns out to be.

Al.