Hi Tony -

You write:

Don't forget that hourlines become harder to see as the dial gets higher.
 3mm wide looks impossibly clumsy at ground level but just right above 4
metres high!

Do you know of any kind of formula to estimate the proper proportions for seeing high or distant dial lines, letters etc. clearly? I suspect architects, engineers and advertisers (billboards) must have some way of knowing what will be clear to a given eye at a given distance.

Ross Caldwell
[EMAIL PROTECTED]
119 48 11W
36 46 14N
Fresno, CA USA

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