My favourite Broadmoor Sirens in action! in this video BAGSHOT DEPOT and CROWTHORNE STATION.
I'm zooming in on the action, hope you enjoy. but turn your volume down :D
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OTHER QUALITY SIREN VIDEOS:
BROADMOOR SIREN REMOVED AND EXAMINED:
   • Broadmoor sirenREMOVED & EXAMINED!!...  
THE HAUNTING SIREN OF RAVENSTRUTHER:
   • The Haunting RAVENSTRUTHER SIREN TEST...  
FORTH/SCOTLAND SIREN TEST:
   • 1940s WWII SIREN ACTIVATING (Forth, S...  
BROADMOOR SIREN PLAYLIST:
   • (2018) The last ever BROADMOOR SIREN ...  
CARSTAIRS (Playlist):
   • NEW SIREN HUNT!  The State Hospital,...  
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SIREN MERCHANDISE now available from http://www.mrmattandmrchay.com
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ABOUT THE SIRENS:
Broadmoor installed 13 sirens in surrounding towns of the Broadmoor secure hospital, to warn local residents of a dangerous person that could have escaped. Broadmoor is a hospital to some dangerous patients.
The sirens were tested at 10am each Monday and I have separate videos for most of them sounding.

THE SIREN HUNT:
Initially these were quite hard to find, but we found them all. Some in council depots, compounds, parks and believe it or not in the middle of housing estates metres from houses! Some are in secure places with no access at all.

HOW THE SIRENS WORK:
The Klaxon CS8 siren.
A 415volt 3phase motor spins two rotors on either side. One rotor is for the high tone and the other for the low tone (the one with most holes is the HIGH tone).
During the escape tone, the airflow is cut alternately (about once a second) to each rotor by a shutter on each end producing the distinctive highlow tones. I believe these are known as CODED SHUTTERS hence the model name Klaxon "CS"8.
Both shutters are opened together for the all clear tone. You can just make out the high and low frequencies being produced together if you listen carefully.

WHY ARE THERE ESCAPE SIRENS?
They were installed in the 1950s/60s with the intention of warning residents in surrounding towns and villages to remain in their homes and keep their children supervised following the escape of a Broadmoor patient.
In those days security at the facility was nothing like it is now and some would say they are no longer needed. But they do a job "to warn". Escapes can never be "impossible", but "more and more unlikely" as security and procedures improve at the hospital.

2018 WHAT NOW?
The siren system was originally installed in the 1950s. The copper telephone wire system is outdated and parts have not been available for many years now.
With various faults developing and lack of parts and knowledge to fix it, a decision had to be made.
   • Broadmoor Sirens  Local resident mee...  
After a lot of meetings and consultations, it was decided to maintain the existing sirens as best as possible then remove them when they fail.
Bearing in mind that security at Broadmoor has been vastly improved since it was built, and the sirens were installed in the 1950s, and now a new 'more secure' hospital nearing completion, it was decided to decommission the whole system rather than spend a lot of money to update it.
By the end of 2018, all sirens were be removed. Here is one being removed:
   • Broadmoor sirenREMOVED & EXAMINED!!...  
A new siren will be installed on the new hospital, which doesn't sound that interesting (electronic, not motorised).
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THE MRMATTANDMRCHAY CHANNEL, established 2009:
I'm passionate about uploading quality and interesting videos for YOU, my audience.
What is my channel about? "Old lift machinery made interesting", old airraid sirens, prehistoric alarm equipment things that I find fascinating and I hope you will too. If "I" don't find it interesting IT DOESN'T GET UPLOADED!
I always spend a lot of time editing my videos with animations, video insync with music and voice overs to make them this way. I'm also a perfectionist!
My moto "Quality NOT Quantity" spending a month editing a video is not a rarity!
But without you, I'm nothing here. Thank you so much for watching.
...mrmattandmrchay is me (Matt) and my son Chay.