<<In the very old times, primitive people knew the rough time from the sun-shadow of the vertical gnomon on the ground. In that case, the shadow of the gnomon rotates clockwise on the north hemisphere, so the clockwise-rotating mechanical clock was made. This is right?>>
I think so - because all the cradles of civilisation were in the northern hemisphere. I've often wondered if clocks would go the other way round if they had been in the south. But I'll ask a subsidiary question If the above IS correct, why did the clockmakers make their clocks go round twice in a day, the shadow didn't. Mike Shaw mailto:[EMAIL PROTECTED] http://homepage.ntlworld.com/jmikeshaw/ N 53º 21' 24" W 03º 01' 47" Wirral, UK. -
