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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In wall weekly that's for sure indicate that this sliding arrow with a window cut out, for example, of cardboard, glued back zasypkoj of the same material.
