Manual step video of making clocks and watches

The video of manual steps for making clocks and watches is as follows:

Materials: light yellow cardboard, dark yellow cardboard and orange cardboard, a two-legged nail for office binding, scissors, glue and black marker.

1. Cut the dark yellow cardboard into a circle with a diameter of 20 cm. Light yellow cardboard cut out 12 small triangles, and orange cardboard cut out 12 large triangles.

2. Glue 12 small triangles around the circle, corresponding to the position of 12 numbers representing hours on the clock. Then paste 12 large triangles on the small triangle. Then turn the pasted sun over.

3. Cut a piece of paper with arrows (one is long and the other is short) to make light yellow cardboard and orange cardboard. Then fix these two pieces of paper in the center of the circle with two pins.

4. Write the number 1- 12 on the yellow triangle corresponding to the hour. This kind of sun clock is ready.

Classification of clocks

1, sundial:

The original meaning refers to the shadow of the sun. Modern "sundial" refers to a kind of timing instrument used by ancient humans to measure time, also known as "sundial".

Its principle is to use the projection direction of the sun to measure and divide the time, which usually consists of a pointer (watch) and a surface (scale watch seat). The sundial timing method is a great invention in the field of astronomical timing, which has been used by human beings for thousands of years.

2, hourglass:

Also known as the sand clock, it is a device for measuring time. The western-style hourglass consists of two glass balls and a narrow connecting pipe. Time is calculated by the time it takes for a glass ball filled with sand to flow into the bottom glass ball from above through a narrow pipe.

Once all the sand flows to the bottom of the glass ball, the hourglass can measure the time backwards. The nominal running time of an ordinary hourglass is 1 min.

3, mechanical clock:

A timer that strikes the time by ringing a bell 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.

4. Quartz clock:

This is a timing tool. Its main component is a very stable synchronous oscillator. Take out the oscillation frequency generated by the synchronous oscillator and make it drive the clock to indicate the time. This is a quartz clock. The best quartz clock can keep the time to one thousandth of a second every day, that is, the difference 1 second is almost 270 years.