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…
Even the heavy bag or the bag will seem half the size, if you use our advice and make them removable handle. To make it out of plywood with a thickness of 10 -12 mm from the PCB or plexiglass.
In the case when you need wooden circle perfect quality to produce such, without special tools is difficult. Here will not rescue the diligent filing of the workpiece in the usual hacksaw; and even the use of a jigsaw will not be able to guarantee the desired purity of the edge of the disc: his brush with all the ability to “cut” roughly. To get out of a difficult situation will help original device recommended by the Hungarian magazine “Earmaster” self-made from scrap materials.
How momentous or simply memorable moments are stored in the slides, carefully Packed you in the plastic frames that are stacked in a special or adapted under them boxes. To organize or group your slides by topics, temporal or geographical indications — experienced photographers are doing on the block of the same drank with some Read more…
…Control knob soft is selected, the glider can easily lift the nose off the ground and shoots up. There, on a five-meter altitude, where popiskivaet on planes fresh wind, we are now going to demonstrate what they have learned to parry the roll of the glider, deviation from course, it’s a “press” machine to the ground, find the optimal angle kupirovaniya, which is necessary for a proper take-off… everything in this free flight! Meanwhile, our glider… can’t fly. Installed it on the building, resembling a well sweep. And is, in fact, the layout. To make such a trainer in the club or at the station of young technicians is not so difficult. It will allow children, dreaming of the sky, to practice a lot of exercises necessary for mastering flying skills.
In the well-known encyclopedia even the last century “Industry and technology” in volume on “the treatment of fibrous substances”, which is a tree, it is said that “in the works for the division of the tree matters … splitting”. And further: “wedge-shaped tool extends the shared part of the tree; here the cleavage of the tree at a distance greater than the tool can penetrate”.
The creation of the Japanese car firm MAZDA (previously it was called Toyo Cork Cogyo) started in 1960 by running a series made popular minicar R-360. Today as popular Mazda2 is a compact front wheel drive model size class. It is enough to remember 2008, the year when the Russian buyers not only choose an appropriate quota of 2 thousand cars, and together joined in a five-month long queue to buy these cars.
To work poster pens are very convenient, and who was fine — what makes them miracles: you can always pick up the desired width of the line, replacing the pen on the right more. But each can hold only one “track”. But this small improvement allows us to obtain two parallel lines… in a single Read more…
