Gravity clock. Drawing, description

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Gravity clock. Children's Science Lab

Children's Science Lab

This simple watch, which uses a combination of water and gravity, can be assembled by anyone with a soldering iron. They will decorate your home and attract the attention of people who are not familiar with the principle of operation of such a device.

The main part of the clock is a metal drum partially filled with water. It is suspended from two cords wound around a rod passing through the drum. Gravity forces the drum to rotate as the cord unwinds, but this process is controlled by three spacer plates soldered into the drum, each with a small hole punched into it. Water flowing out of these holes gradually shifts the center of gravity of the drum, which causes it to rotate.

Rice. 1. Gravity clock

For this clock, shown in Figure 1, the bottom of a 14 cm long tomato can was used. The rod passing through the center of the can has a diameter of 4,8 mm.

Figure 2 shows the installation of partitions. During the assembly process, the plates are inserted into the slots of the cover, from where they protrude slightly, and soldered, which makes it possible to make a waterproof drum. The axis passing through the drum is also soldered.

Rice. 2. Assembling the gravity clock

A hole with a diameter of 6 mm is drilled in the lid, through which water is poured, and if water is boiled in the drum just before sealing, then the risk of rust will be eliminated, since there is no oxygen in the boiled water that causes corrosion. Naturally, the drum must be completely sealed.

Gravity clock
Rice. 3. The principle of operation of a gravitational clock

After the device is assembled, it will be necessary to fix it on a temporary suspension in order to determine the length of the hour scale. This must be done before the device is installed on its permanent hanger. The drum is placed in an outer case made of bronze, which will give the watch a beautiful appearance. In order to mark the clock scale, some experiments will be required. To accurately mark the scale, use an accurate clock.

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External DVD recorders from IO Data 12.04.2004

IO DataI-O Data has announced the DVRP UT4 and DVRP-UN4 portable DVD writers.

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The DVRP-UT4 uses a TEAC DV-W24E drive, connects to a computer via a USB 2.0 interface, and can burn DVD-RAM discs at 2x speed, DVD-R at 4x, DVD+R/RW at 4x. DVD-RW - from 4x. CD-R "blanks" with 16x and CD-RW - with 8x.

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