At first glance, the school gym is the same as thousands of others. But this is only at first glance… Observant person will note here something unusual. On boards and panels, attached to walls, installed button. Hanging above the light Board. The gym class begins with warm-up, and then the class is divided into groups. Students in one group with a small running start then jump at a time, hand hitting the button. While the scoreboard lights up every time the figure is estimation.WHY THE CHISEL HANDLE?
Wrong strike with a heavy hammer can cause serious injury to the hand holding the chisel. Yes, and a hell of a kick in the arm unpleasant. This work will facilitate and protect a simple removable handle (see Fig.), bent from steel strip and fixed at the top of the tool with the bolt-ladder. It Read more…
The Internet caught the eye diagram of the automatic charger Ni-Cd batteries developed by Yuri Bashkatov. Assembled the circuit on the breadboard — not working. Modeled it on the computer using the program Work Bench. The result is what is shown in the diagram. The device operates as follows. The transistor VT1 (p-n-p) is open if at its base there is a negative potential, which may appear when the VT2 transistor (NPN) open — this, in turn, occurs if the potential at its base is installed with the variable resistor R4 will be 0.3 — 0.4 V higher than on its emitter.
If during the day to measure the mains voltage, the voltmeter each time will be different. This is due to you can enable or disable individual power consumers, changing mode of operation (in accordance with the work schedule of production, process flow, etc.), that is, change the values of loads that cause instability of voltage in the networks.
Rezinomotornaya model aircraft class b-1 designed and built in the aeromodelling circle of the pioneer Chkalovsky district of the city of Sverdlovsk schoolboy Vladimir Ivanov. Speaking with her, the young designer won the regional, zonal, Republican and all-Union competitions of the Fifth model airplanes young men and juniors. And at zonal and all-Union competitions resonatory showed the maximum score of 600 points. The championship of the USSR in Novosibirsk, she was recognized as the best in its class.
a LITTLE SENSATION. “After the invention was patented not only in Australia but also abroad, the curtain of secrecy that until recently hid work Ralph Sarich several parted. The look of the new motor is strikingly different from its predecessors. A prototype orbital engine is a solid disk with a diameter of 40.6 cm, a thickness of 12.7 cm and weighing about 45 kg, which are placed around the rotor of the combustion chamber… Engine Serica develops up to 200 horsepower. According to experts, in the mass production of orbital engine due to the simple design (only 10 moving parts) will cost many times cheaper motors used in the automotive industry at the present time”. This information was placed in the newspaper “Pravda” on January 20, 1973.
Did you know that the first domestic car, which became the hero of a thousand jokes became legendary minicar, created at Zaporizhia automobile building plant? If a quick “flip through” a hefty volume of the complete collection of the works of the oral creativity of the Soviet people, one of its most significant chapters will probably be entitled “Jokes about “Zaporozhets” And this is a sign of the unprecedented popularity of this machine have a Soviet man that went from “hunchback” ZAZ-965 and “eared” ZAZ-966 front-wheel drive cars, the first of which was the ZAZ-1102 “Tavria”.