When I needed a megaphone, I became acquainted with the prices of Chinese industrial products: as it turned out, they cost from 1500 to 8000 rubles., and found that such a device can collect a couple of hours with her hands. A megaphone (or loud speaker), an electrical circuit which recommend and bring forth, be useful for sports, in advertising, in conditions of constant excessive noise, playing games with the child and even in the minibus for broadcasting information to passengers in the rear seats.
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In 1966, the Commission on space models of the International aeronautical Federation (FAI) has developed a code of sport in which raketoplana divided into four classes and assigned a so-called “bird” names “Sparrow”, “swift”, “eagle” and “Condor”. On the amended in 1975 and 1989 the FAI code partition models raketoplana into categories and classes depending on the total impulse of the engine and the starting mass was clarified requirements for each category, classes are five, and since 2001 to six. Today we will talk about the category of raketoplana S4 — models of gliders with the accelerator Category is subdivided into six classes the Most popular class S4A — promised.
In Amateur practice when developing or establishing a device is often required to connect to it a certain load and still it is necessary to measure its output parameters. This scheme allows you to connect your device to one of 22 different loads the Connection of a load is either a permutation of the jumper plug into the corresponding socket, or by using two app switches the type of the EGP on 12 position Device P1 allows you to control the load voltage in three ranges to increase the accuracy of the measurement Device P2 monitors the current flowing through the load Resistors is desirable to have a capacity of at least 10 watts, C5-16, etc.
The quality of cement is usually determined by destruction of the samples. Moreover, this process lasts from seven to twenty-eight days. To speed it up decided young technicians of the radio circle of the pioneer city of Iskitim of the Novosibirsk region. “The task we were given in Vries cement plant — said the group members Zaitsev. — Together with the guys we have designed and built an instrument (Fig. 1), which brand of cement you can determine almost instantly”.
Washer spherical washer is different from the General purpose (i.e. flat) and surface form, and purpose. This fastener may be used in cases when you want to eliminate bias, the fastening of the parts during retraction. No independent use has. Used is bundled with other hardware (they may be nuts, studs, bolts). Is intended to increase the area over which the load when the coupler parts.
