1. First, put the bottle cap on the red cardboard and draw a circle with a pencil.

2. Cut out a circle along the drawn trajectory with scissors, draw four points on the red circle with a pen, namely, center, top, bottom, left and right, then mark the red circle, and mark other points evenly (*** 12).

3. Then mark the number 1- 12 clockwise to dial the clock. Cut out three hands with different lengths and a small central circle with different colors of paper, and then nail the three hands and the small central circle together with thumbtacks and nail them together on the red dial.

The clock is a timing device and a precise instrument for measuring and indicating time. Clocks are usually distinguished by the size of the internal machine. According to international practice, clocks and watches with a movement diameter greater than 80 mm and a thickness greater than 30 mm; A pocket watch with a diameter of 37 to 50 mm and a thickness of 4 to 6 mm is called a pocket watch.

Watches with a diameter less than 37 mm; A watch whose diameter does not exceed 20mm or whose movement area does not exceed 3 14m2 is called a women's watch. The watch is one of the smallest, strongest and most sophisticated machines invented by human beings.

The power of modern clocks and watches includes mechanical force and electricity. Mechanical clock is a kind of timer which uses the energy released by heavy hammer or spring as power to drive a series of gears to run, adjusts the speed of gear train with the help of escape governor, and indicates time and metering time with hands.