金沙平台官网登录网址

Pitch drop caught on camera after 69-year wait

作者:车燹诰    发布时间:2018-02-13 06:00:43    

IT TOOK 69 years, but at last we’ve seen pitch drip. One of the world’s longest-running experiments climaxed last week, when a finger-sized bulb of pitch (bitumen) separated from its parent bulk. “After 69 years, a finger-sized bulb of pitch has been recorded dropping for the first time” The experiment was set up at Trinity College Dublin, Ireland, in 1944. The original version, at the University of Queensland in Australia, has been running since 1930. A drop has fallen about once a decade, but the Australian team has not yet seen it happen. Shane Bergin set up a webcam at Trinity last year. Filming the drop let the Trinity team calculate that the pitch is two million times more viscous than honey. John Mainstone, custodian of the Queensland experiment, is taking the news in his stride. “I’m not shedding a tear – as many people seem to think I should be,” he says. Instead, he scrutinised Trinity’s footage to see what happens as a drop breaks free. “Sadly, I found that the cunning visco-elastic pitch had decided to outwit me yet again.” The Trinity drop touched the bottom of its container, then detached sideways. Arguably,

 

Copyright © 网站地图