For this project, instead of trying to quiet his blower, he decided to make one as loud as possible in the form of an air raid siren. The basic idea behind [Matthias]’ air raid siren is to make ...

Some people hear an air raid siren, and assume there must be an historical war re-enactment taking place nearby. I am the third type of person, who hears a 3D-printed air raid siren and ...

[MrExpert] is here with the build you need – an air raid siren you can print at home. It’s a simple build, which makes it fun and accessible for just about anyone with a 3D printer. Rotational ...

In the early hours of March 10, 1945, she climbed a nearby mountain while an air raid siren blared. When she looked in the direction of Tokyo, she saw the area a bright glowing red. “Please save ...