Old, leaky canister can still serve as a spray for watering garden lands: just need to neverlet it along the contour of a series of holes with a diameter of 3… 5 mm.
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THE TIMER CONTROLS THE SOUND
The device, whose scheme is published in the journal "Popular electronics" (USA), produces a positive pulse when a sound (for example, firing of the gun) reaches the microphone B1 (see...
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(THE BUILD-POLYOPIA). Building the model-polyopia begin with the manufacture of the fuselage (Fig. 1), the contours of the lateral projection should most accurately reflect the...
