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 the “range” of the Telegraph, put a lamp made from tin or heavy paper tube — a tube length of 20 cm.
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BUTTON-HAT
If you want to attach the fabric to the wood (for example in the repair of old furniture) and upholstery nails with big heads, no, you can use a normal kizlarskoye button.
CARDBOARD CAR
To join automodelismo the summer holidays will help is quite simple and yet quite successful design of a sports car. Created in Leningrad by modelers, it has proven to be promising for...
