In a message dated 11/2/2004 5:44:15 AM Eastern Standard Time, [EMAIL PROTECTED] writes:
<< I believe (purely as conjecture I must say) that they were part of the laying out and indeed the marking process and not only denoted the gnomon corners but took pins against which a rule was laid. Other punch marks can be seen where compasses were centred to draw the hour circles for example but these do not go through the plate. On a double horizontal dial there are a lot of compass centre dots to be found! >> I have no idea if this is correct, but I recognize that it is an excellent answer. Thank you for sharing it. -Bill -
