Clock mechanism was designed by David Ziemkiewicz (author of the book shown with the clock), slightly modified by me to sit on a table and to be built entirely from Lego elements. I've got it accurate to less than 1 minute of error over 30 minutes. With an adjustable pendulum (length and position of the weights change the timing) I should be able to dial it in closer. submitted by /u/jormono [link] [comments]