[How do I?] Radius gauge for 'large' values of radius

I don't have a micrometer that big, so I used a decades-old outside caliper to free-hand it as best I could. Keeping it centred in two axes was a chore. It appears to be constant-radius, so spherical at 4²³/32" Ø.

I really do need to get a larger capacity micrometer.

Thanks for the help!
 
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