I thought it might be useful for people to be able to compare all the calipers on the one page, so I made a comparison chart. Caliper Description Smallest measurement Largest measurement Price (USD) Most often used by Small Calipers 120mm or 4.5″ high – smallest of the 3-armed calipers 9.5mm or .37″ 189mm or 7.5″ $65 Beauticians Artists working with detail, or smaller pieces Dentists (working with photos or screens) Craftspeople Medium Calipers 180mm or 7.2″ high – the original design. Also available as a heavy-duty 2mm thick version (ask if you’d like these) 13.4mm or .57″ 320mm or 12.8″ $85 Artists Luthiers Farriers Teachers / Education Dentists (working with photos or screens) Craftspeople Large Calipers 320mm or 12.8″ high – These are the largest calipers I make – just over a foot long. People usually buy these as a set of three… because that way you get the…

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Over the years, I’ve built up a collection of Golden Ratio Calipers… and I decided it might be quite useful for people if I made a video comparing them. Some of them are really good – some terrible. So I set up my camera… and found that my video-space looked a bit bare… needed a painting. So I decided to make a video of me painting a painting – to demonstrate how the golden ratio works with artistic composition. It was a semi-controlled crash from start to finish with things going wrong almost immediately: But it turned out ok in the end. I was using the large (320mm (just over 1 foot)) calipers available here There is a far far better video from Stephen Silver describing how the golden ratio can be used with composition here: He’s a proper graphic-artist though – I’m an engineer/musician, so struggle with the practicalities…

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