Depressing statistic of the attacks on the secrets and the assets of the firms, organizations, entrepreneurs (and ordinary citizens) makes it necessary to take appropriate countermeasures, in particular, to acquire security devices and even systems. The proposed technical solution is one of them. Responsive to the appearance of outsiders (outsiders) in a protected area, this electronic guardian offices, apartments, warehouses and other premises in my own way belongs to the rightful owners and employees have “radiolocate” in the form of trinkets.
“BRACELET” DISABLED
Elderly person or disabled person to raise the fallen or vyskolznula from the hands of the stick is always a problem. Easier to recover from this situation using a simple “bracelet” (from a leather strap, cord or tape) threaded into the handle hole, as shown in the figure. V. GOLOVASHIN, Rybnoe, Ryazan region.
THE TRUNK GUARD
Krysheval the trunk will be of interest to owners of cars that do not have a garage and have to leave to spend the night steel “horse” under the open sky. Most of them equip their vehicles with security alarm. However, it often works even from a passing truck or a number of powerful peals of thunder, breaking the night’s rest of residents.SPRAY AT HOME
In your magazine (No. 5, 1974), we wrote about how to extend the life of the aerosol can using a Bicycle valve. Here is another diagram of a homemade spray paint suggested by our reader A. by Malmakov from Alma-ATA region.RIVAL HELICOPTERS
In the late 1950 O. K Antonov as chief designer of OKB-153, located in Novosibirsk, invited the leadership of the air force of the CAF and the draft aircraft short takeoff SLE-1. In the diagram of the machine catches the eye first of all, empennage mounted on two thin beams. Direct highly mechanized wing with flaps, drooping ailerons and an automatic end slats are two radial air-cooled engine AI-14R. It is through these engines takeoff power of 265 HP was able to put into practice the intentions of the designer.LIGHT TELEGRAPH
Someone who knows Morse code or just going to study it, can build a simple device, shown in the figure. On a plywood Board install the battery B and the lamp L of the flashlight. Contactor In the manufacture of contact plate faulty relay. Now connect the parts to each other by wires. To increase Read more…
RACING FROM USSURIYSK
Vitaly It student from Ussuriysk, VI all-Russian competition of young avtomodelistov won first place. His car with the air screw has a top speed of 128 km/h.THERMOSTAT
This device is not very complicated and consists of the heating element, the mercury column and the solenoid. When the current is switched on starts to operate the heater — closed working contacts of the relay. When it starts to heat up the mercury, and the column rises to the level of the contact turns Read more…
THE STEREO FROM THE POSITION OF EXPERT
You love music, but not always have enough time and opportunity to go to the Opera or attend a concert. However, modern high-quality instrument sound allows you to “go” at the concert of your favorite artist and comfort of your own home. But before you buy such equipment, you need to know what requirements it must meet.SPANISH LANDFILL LUFTWAFFE
Fighter Messerschmitt BF-109 first modifications. The Treaty of Versailles in 1919, signifying the end of the first world war, significantly limit the military potential of Germany. The Germans were allowed only to have a 100-strong land army, devoid of all heavy military equipment, but German industry was forbidden to carry offensive weapons.










