Units in Clock Published on July 26, 2018 in Calculating the Number of POLCA CardsFull resolution (883 × 883) Units in Clock illustration of different units of time in a clock. This work by Christoph Roser at AllAboutLean.com is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Please credit the image as shown below. For digital documents and web pages please do include the links as shown below. Thank you.By Christoph Roser at AllAboutLean.com under the free CC-BY-SA 4.0 license.