Marvin, that does make a lot of sense. I often assumed that the old masters would have tried to make work easier for themselves given any technology they had at the time but I was never really sure. I do recall seeing a watercolor that Sargent did of a building in Venice last summer and it did have straight lines in graphite left over.
Michele, I was considering using a plumb line but haven't gotten the chance to yet. I've never used a caliper before but that does sound like something that would help me in certain cases. I shall get one the next time I'm out.
I do feel more confident in using such tools now and your points on why it would be acceptable eases me further.
Thanks!
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