The chemical method of plant protection against pests, diseases, and weeds remains the main one today and for the foreseeable future. Most often, it is implemented by spraying agricultural crops with aqueous solutions of pesticides. The quality of spraying determines the effectiveness of the product, its application rate, and the level of environmental pollution. Therefore, Read more…
Summer vacation time is approaching. To the numerous concerns related to preparing for the upcoming vacation, aquarium owners have one more: how to provide everything necessary for the underwater inhabitants during the owner’s absence. If you have no one to entrust your aquarium to, entrust its care to an automaton (Fig. 1) and rest peacefully. Read more…
No matter how good a tool or even a machine a home craftsman has, drilling a hole accurately or machining a workpiece properly while holding it with pliers, let alone in one’s hands, is frankly impossible. That is why any home workshop, even a beginner’s, includes a vise. True, this useful device is not always Read more…
For high-quality and fast painting with airbrushes and spray guns, for many other jobs in a home workshop, a desktop mini-compressor that can be assembled from a refrigerator compressor unit is suitable. Moreover, it is not at all necessary to use a new unit: one with clogged pump valves will do just fine. The main Read more…
The widely used electric guitar inherited its tuning from its predecessor—the six-string Spanish guitar. The highest note that can be played on the instrument is usually E of the 3rd octave (for comparison: on the violin this note is E of the 4th octave, and on the piano—C of the 5th octave). On most electric Read more…
WHAT IS BIOGAS? Recently, more and more attention has been drawn to unconventional — from a technical point of view — energy sources: solar radiation, sea tides and waves, and much more. Some of them — such as wind — found wide application in the past, and today are experiencing a renaissance. One of the Read more…
No one will argue that a velomobile is good for your health. And for lovers of technical creativity it is doubly useful, as it provides invaluable experience before building more advanced designs. The velomobile described here was designed and built in the workshop of the Young Technicians’ Station in our city together with club members. Read more…
At the 1983 European Championship, many athletes’ attention was drawn to the “aerobatic model” designed and built by Czechoslovak modeler Stanislav Čech. The unusual engine position, increased bending elasticity of the detachable wing, simple and effective contours of the fuselage that read excellently in flight, and a whole range of design innovations benefited the operational, Read more…
For water procedures there are quite a few different devices. In Russia, the traditional ones are the banya, the bathtub, and the shower. People say that the banya heals, the bathtub relaxes, and the shower invigorates. In addition, a shower is the quickest way to wash, not requiring any special preparations. In my view it Read more…
Many youth technical stations have their karting sections. The kids who train in these sections build and improve their karts themselves, achieving very good results in competitions. So what’s next? Logically — high-speed racing cars. But teenagers cannot compete in them: driver’s licenses can only be obtained from the age of 18. In recent years, Read more…
