"Dave Shrader" wrote -
Seriously, I wonder if any readers recall the details of measuring and
plotting based on the GR Slotted Line?

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What's 'GR' ? Never heard of it.

Never-to-be-forgotten, I first measured SWR on a laboratory bench slotted
line in the town of Stockport near Manchester around February 1944. V1's and
V2's, Hitler's secret weapons, were falling on London and S.E. England. The
1000-bomber raids by the RAF on German towns and cities, the fire storms
directed by Air Marshal Bomber Harris, were building up with an ever
increasing ferocious intensity. One night 110 heavy bombers failed to return
to base. The death toll in Europe and Russia had already passed the 15
million mark.

I remember it was raining at the time. It always rains in Manchester.

There were two simple relative voltage measurements spaced 1/4-wavelengths
apart. Values of Zo, Zg, Zt and Gamma were quite irrelevant. The only
mathematical equation was SWR = V1/V2. And that's all there was to it!

So began my radio education.
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Reg, G4FGQ