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”.WHAT BRAND OF CEMENT?
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.
How quickly and firmly connected to the flat parts? For example, lined with metal or other hard surface insulating mats, where access from one side? A simple and effective solution was offered by the participants NTTM-78 V. ul and A. Khromov. They have designed a kind of paper clip that allows you to quickly and thoroughly implement such connections.
In practice, the repair of radio equipment and the creation of amateur radio designs are cases when it is necessary to highlight the portion of the circuit Board (PCB) to pay an additional light source, which is convenient to fix the lamp on the handpiece housing. In this light source should be small, and its direction of flow in the soldering tip.