Here is a pic of an embossing tool  I made for a local ceramicist:

I made several wheels, but only one holder.  He now wants another holder but can’t give me the original to measure because “it’s in constant use”. And of course I can’t find my construction notes if ever I made any.

What I’m wondering is if there is any way of reconstructing the dimensions of the holder from the photo when given:

a) the diameter of the wheel

b) the information that the ‘corners’ of the holder are at 90 degrees.

I sort of think that mathematically it could be possible because (b) might allow calculation of the perspective angle from which a ‘face on’ perspective could be generated and then (a) would give a metric.

I realise that the most direct approach would be to tell the guy that if he wants an exact copy he’d better give me the original to measure or no deal, but now I’ve got interested in whether it’s possible to do this sort of reconstruction.

Robin.