Material preparation: paper, pen, round bottle cap, scissors and thumbtacks.

1, now start making: first put the bottle cap on the red cardboard and draw a circle with a pencil.

2. Then, use scissors to cut out a circle along the drawn track.

3. In the same way, cut a circle with white paper.

Next, fold the white circle in half and fold it again, then press the crease.

5. Now, open the white circle and overlap it on the red circle. At the center point and end point of the two diameters, pin a small eye as a sign.

6. Take away the white circle and draw four symmetrical points on the red circle with a pen.

7. Divide the quarter sector into three parts with a white circle and mark it on the red circle.

8. In the same way, other points are evenly marked, one * * * twelve. Represents twelve hours.

9. If you need to know the minutes, you can draw them on the dial. Then mark the number 1- 12 clockwise, and the clock plate is ready.

10. Cut out the hour hand, minute hand and second hand with different thicknesses and lengths and a small central circle with different colors of paper.

1 1. Nail the above parts together with pushpins.

12, and then nail it on the red dial, as shown in the figure below.

13. Nail or stick the dial on the favorite bottom plate, and the clock model is declared complete. Turn the pointer and set the time to watch.

Types of clocks and watches:

1, mechanical clock

The mechanical clock is a kind of timer that tells the time by ringing the bell, and it is the crystallization of human wisdom. The earliest mechanical clocks in the west appeared in European monasteries in the13rd century, and mechanical clocks driven by heavy objects first appeared in British monasteries.

At that time, the mechanical clock chimed every hour to inform monks to carry out various religious activities on time, but it was not completely related to people's daily life.

2. Electronic clock

It is driven by electric energy (alternating current or battery), and the basic components are generally composed of electronic components (the pointer system is also mechanically driven). The timely electronic clock is the most widely used electronic clock. Due to the use of the synchronous oscillator with stable oscillation frequency and the corresponding integrated circuit, the synchronous electronic clock has obvious advantages compared with other clocks, including high travel accuracy and good stability.

3. Photoelectric clock

Taking light (including natural light and electric lamp) as energy source, silicon photocell is used to convert light energy into electric energy, which is input into storage battery to supply electric energy for clocks and watches. The charging voltage and current of silicon photovoltaic cells can be designed as required. Although this kind of clock avoids the trouble of replacing the battery, it increases the manufacturing cost.