Vintage Wall Clock

Regularly upload, mechanical pendulum wall clock, it is very common before the 1990s. As long as you regularly close the strips, the clock will drop the answer, and the left and right swings will never stop. Every time, it will be preferred to be ~
This kind of old-fashioned clock believes that many people will not be unfamiliar. The upper side is the dial, and the time point is generally marked with Roman numbers. The lower part has a one hour, which will swing around, it is a second. That is very interested in the swing of the gall, often staring for a long time. Later, I learned my physics, I know the principle, and I know that the bell argument is in the harmonious vibration.