An unusual timepiece can be found at the Petrovaradin Fortress of Novi Sad, Serbia. Locals often call it pijani sat (drunk clock), because its accuracy fluctuates depending on the season. The clock consists of three interconnected systems: the timing mechanism that keeps time and powers the clock hands, a striking mechanism that sounds the quarter-hours, and another striking mechanism that sounds the full hours. The timing mechanism is sensitive to changes in temperature. When the weather is cold, the clock tends to run a few minutes behind; When it’s hot, the…
