Another art project from a five-liter bottles — the mouthpiece, which are used by the tourists. You only need to cut off the bottle bottom and the mouthpiece is ready. If “communication” it is alternately applied to the lips (the transmission), then to the ear (receiving), and the range of communication on the water with a pair of such horns, it turns out considerable — under favorable conditions up to a kilometer.
Recommend to read
LIGHT AT LOW SPEED
Velodyne, works great at high speed, but worth a go on a broken road — the spotlight begins to fade. The reason is lack of frequency of rotation of the rotor of the generator at low...
IMPORTED AND IMPROVE
A commercially available power supply units are Chinese — made adapters have several advantages: they have an attractive modern design; dimensions distinguished by compactness; the...
