Horn and Whistle Forum International

Some screenshots from Wayback Machine capturing the home page and service page contents of the Sirens Horns & Hooters website

R.V.B 4100 Series Electromagnetic horn. These were discontinued in 2008 and replaced with the 4100E which incorporates a PA horn loaded speaker instead.

I believe there may be a longer version of this document somewhere. But nonetheless, this is pretty cool.

Various models.

Filed in 1977 by chief engineer Francis. X. Reilly at Leslie Controls, Parsippany NJ.

'RS' stands for Reilly-Supertyfon. Named in honour of its inventor.

Details E-2, AA2, A2, etc

Nathan Airchime Kettledrum 'K' horn patent. Filed 1954 by Robert. E. Swanson of Airchime.

Nathan Airchime Modulus 'M' horn patent. Filed 1950 by Robert. E. Swanson of Airchime.

Documentation from a well known German horn/audible warning device manufacturer

April 1978 Schematic. Shortly after the release of the 'RS' chamber