Image: Water Clock in Ancient Agora of Athens

Description: The water clock kept time for speeches, with water emptying at a controlled speed from one bowl into another. Senate speeches were six minutes and it became an art form to deliver an effective message in that time period.
Title: Water Clock in Ancient Agora of Athens
Credit: originally posted to Flickr as Water Clock
Author: Sharon Mollerus
Permission: This image, which was originally posted to Flickr.com, was uploaded to Commons using Flickr upload bot on 16:44, 10 April 2009 (UTC) by Dorieo (talk). On that date, it was available under the license indicated. This file is licensed under the Creative Commons Attribution 2.0 Generic license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). http://creativecommons.org/licenses/by/2.0 CC BY 2.0 Creative Commons Attribution 2.0 truetrue
Usage Terms: Creative Commons Attribution 2.0
License: CC BY 2.0
License Link: http://creativecommons.org/licenses/by/2.0
Attribution Required?: Yes