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shadowgovt04/01/20252 repliesview on HN

What would be the process to do that? To aim 0 and 100 properly, you'd need a tool to calculate a 100:28 (25:7) ratio on an arbitrary distance, wouldn't you?

One can build such a tool, but it's not a doubled-over piece of string.


Replies

oddmiral04/01/2025

Make marks on the thermometer at 0 and 100 degrees C, then project light from a candle to a wall to see these marks with say 5x magnification. Now project marks from the 128 mark ruler to the same wall and align marks from both, then place marks on the thermometer with 5x better accuracy.

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fluoridation04/01/2025

Surely you can simply use a ruler and rotate it away from the parallel to achieve any arbitrary scale, right?

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