What coil do not occur now in our everyday life and tape, and fishing, typewriter and film projector and all have one awkward feature: they are wound — tends to unwind. For all of them a simple and reliable latch will serve kolejno of underwear elastic: soft and wide, it does not give content to unwind the coil.
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The collet pens and pencils, wearable in a breast pocket, their cap will not accidentally presser spring has a tail: thanks to him, they will not fall out of your pocket. You can not say...
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An incubator for breeding chickens at home can quickly to make, having a thermostat with indicator light on and the cord with plug (eg, burnt-out iron), a couple of 300 Ohm tubular...
