![A WWII Brook Motors air raid siren, Thorpe Camp Visitor Centre, a WWII Royal Air Force barracks, Lincolnshire, UK Stock Photo - Alamy A WWII Brook Motors air raid siren, Thorpe Camp Visitor Centre, a WWII Royal Air Force barracks, Lincolnshire, UK Stock Photo - Alamy](https://c8.alamy.com/comp/2DDYF27/a-wwii-brook-motors-air-raid-siren-thorpe-camp-visitor-centre-a-wwii-royal-air-force-barracks-lincolnshire-uk-2DDYF27.jpg)
A WWII Brook Motors air raid siren, Thorpe Camp Visitor Centre, a WWII Royal Air Force barracks, Lincolnshire, UK Stock Photo - Alamy
Siren - Carter Air Raid Siren Ww2 Sound Effect - song and lyrics by Hollywood Sound Effects | Spotify
![British Air Raid Sirens (WWII/Cold War). Carter & Castle Castings and Gent's of Leicester sirens. - YouTube British Air Raid Sirens (WWII/Cold War). Carter & Castle Castings and Gent's of Leicester sirens. - YouTube](https://i.ytimg.com/vi/HmrTFZdyYxY/hqdefault.jpg?sqp=-oaymwEmCOADEOgC8quKqQMa8AEB-AHUBoAC4AOKAgwIABABGFUgYihlMA8=&rs=AOn4CLCVygXooywFH-Fd91sG9Lq3Y2H5Xw)
British Air Raid Sirens (WWII/Cold War). Carter & Castle Castings and Gent's of Leicester sirens. - YouTube
![Stuff that occurs to me: Does the pitch of an air raid siren vary with the frequency of the electricity supply? Stuff that occurs to me: Does the pitch of an air raid siren vary with the frequency of the electricity supply?](https://i.ytimg.com/vi/rwS58TC665Q/maxresdefault.jpg)