Bookend. Drawing, description

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Bookend. Tips for the home master

Builder, home master

In order for the books on the shelf to stand vertically, they are propped up with such stands made of two scraps of a board connected at right angles and a reinforcing crossbar. However, on a polished surface, the stand may slip under the weight of tilted books.

This will not happen if both of its outer surfaces are pasted over with thin rubber, preferably corrugated.

Bookend

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Random news from the Archive

The submarine will go to Titan 24.02.2015

NASA will send a submarine to Titan. The mission of the submarine will be to explore the hydrocarbon sea of Saturn's largest moon.

Titan is the only satellite with a dense atmosphere and the second celestial body in the solar system after Earth to have seas and lakes of liquid hydrocarbons. The largest of the seas of Titan is the Kraken Sea, located in the northern hemisphere of the satellite. Its area is about 400 thousand square kilometers, and the depth reaches 300 meters.

A promising submarine will move with the help of an electric motor and reach speeds of up to 1 m/s. During the 90-day mission, the submarine will cover a distance of about two thousand kilometers, filming the surroundings of Titan on the onboard camera.

The radioisotope Stirling generator, which will be installed on the ship, will provide the submarine with the necessary energy and save the electronics from freezing. Unfortunately, prototypes of the high-tech generator are expected to be ready no earlier than 2040, so the mission is unlikely to start earlier.

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