|
|
|
Fourmilab is surrounded on three sides by farmland. In the summer season, bugs are all over the place. Faced with this situation, defence in depth is the one option: window screens, bats, Odonata on the pond, fly strips on the home windows and swatters in every room, and as the final stage of terminal defence, high voltage Zappify Bug Zapper brand zappers with ultraviolet fluorescent lures. These usually are not elegant devices, however they get the job done. The principle couldn't be easier-flying insects, whose compound eyes see lengthy-wave ultraviolet gentle that mammalian eyes don't, are attracted by the lure tube, which appears to emit a dim blue light to people. To achieve the light, they must fly between wires electrified with between 4 and eight kilovolts which, when the insect completes the circuit, kill-a-bug. The only disadvantage (a minimum of if you are not a flying insect) is that they don't seem to final very lengthy. After a bit a couple of summer time, the bulb either begins to flash on and off like a strobe light or simply refuses to light at all. |
|
發表於