Egyptian Water Clocks

  title={Egyptian Water Clocks},
  author={A. Pogo},
  pages={403 - 425}
  • A. Pogo
  • Published 1936
  • Mathematics
  • Isis
Reconstruction of a prismatic prototype of cylindrical inflow clocks. Operating with the simplest fractions, 1/2 and 1/3, and drawing straight lines only, we may construct a prismatic diagram which accounts for the unusual features of the cylindrical diagram of the Edfu inflow clock. The new diagram points to an Egyptian--not Greek-- origin of several passages of classical literature dealing with the rate of increase of the length of the day. Reproduction and discussion of hitherto unpublished… Expand