May 9, 2014 ex-USSR countries celebrate the 69th anniversary of the Victory in the great Patriotic war of 1941-1945. May 9 special the occasion is and the joy of victory and the pain of the millions who died. It is a holiday with tears in the eyes… With The Victory!
History of the machines is often dramatic way design searches, bitter disappointments and victories. In this respect, the distant past off — one of the most interesting pages in the development of the car. Even briefly getting to know her, convinced of the validity of the old and wise sayings: “Everything is already someone once invented.” Indeed, we think the modern powerful vehicles with high cross — the fruit of creativity solely by our contemporaries. But it is not.
At roofing unlikely to lay the slate so that we never need to cut off, adjusting the size of the roof. And someone had to do it, you know what asbestos-cement sheet is not plywood, the hacksaw is hard to. The procedure will be easier if the pre-designated cutting wet on both sides (for example, Read more…
A simple clamp can be made of three parts: a section of steel channel, bolt and nail. This homemade tool does not give the factory.
If you need kremowy clip, that you can make in literally five minutes. First of all, taking the cap from any tube — of cream or toothpaste and nut. Put the cap on the table screw hole up and put him on the nut. Carefully heat CE soldering iron — she begins to sink into Read more…
The beauty of this glider, named “Tetra” (because of the shape of its frame), is that it is collapsible and place of training it is possible to carry in a bag or backpack. It weighs more than 20 kg. Frame glider — tetrahedron, assembled on bolts of duralumin or steel tubes. The mast compound, its elements represent segments of dural pipes with outer Ø 40 mm, stacked with pipe sections of smaller diameter. The lower part of the mast is integral with the frame Buer from the pipe Ø 50 mm.
Our magazine has already told about this exciting game, made on the electromagnetic relay (see “M-K” №1, 1976). And today hams instead of contact devices are widely used in their structures with modern elements as transistors, thyristors, LEDs, integrated circuits. New versions of the game “Who is faster?” with the use of such devices and readers.
Instead of bulky and uncomfortable electrostatic machines Wimshurst, coils Ruhmkorff in high school physics classrooms are increasingly high voltage converters voltage. They can be used to Pro* led experiments in such branches of physics as electrostatics and current in gases. We offer our readers “e-stick” — one of those devices.
The hole in the metal plate can be obtained without drill: it is enough to bend it and work a round file or a needle file. This technique is especially useful when you want an oval hole. It is applicable for punching a rectangular window or a narrow slit: in this case, use is not Read more…
To explore the law of gravity is always more difficult than any other section of the school of physics. The fact that to explain this phenomenon the teacher has literally “on fingers”. And devices demonstrating the action of gravitational forces, the industry is not yet released.