A typically circular device used to tell the
time. It uses three sticks or "hands" that point to numbers and lines that were printed out on a layer of typically painted cardboard attached to the back. This uses about three of these "hands",
one the thickest and shortest, (known as the HOUR hand), another that is slightly taller and thinner than the hour hand, (also the MINUTE hand), and the thinnest and longest
one, (the SECOND hand). The hour-hand moves across each number or
line each HOUR, the minute-hand each MINUTE, and the second-hand each SECOND. These are usually run by batteries nowadays, where the battery turns a series of gears to keep the clock going. Sometimes the clock displays the
time directly, on a screen, these are known as digital clocks. You can find
something similar displayed on your
phone. But some are run by Pendulums! That's pretty cool. These come in many form-factors, too. These are useful machines with good purpose.