Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on Concrete blocks that once protected Britain.
I'm sure I've seen the Observer Corps using them south of London in WW2 to help track incoming aircraft but can't find anything specific. I did find https://rarehistoricalphotos.com/aircraft-detection-radar-19... and http://www.douglas-self.com/MUSEUM/COMMS/ear/ear.htm which have quite a lot of photographs of various devices.
On a related note last time I visited the Jodrell Bank radio telescope they had whispering dishes you could play about with.
https://www.geograph.org.uk/photo/4117915
There are no comments on this comment yet.
I'm sure I've seen the Observer Corps using them south of London in WW2 to help track incoming aircraft but can't find anything specific. I did find https://rarehistoricalphotos.com/aircraft-detection-radar-19... and http://www.douglas-self.com/MUSEUM/COMMS/ear/ear.htm which have quite a lot of photographs of various devices.
On a related note last time I visited the Jodrell Bank radio telescope they had whispering dishes you could play about with.
https://www.geograph.org.uk/photo/4117915