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ACA Allertor 125
The ACA Allertor 125 is an outdoor warning siren made by American Signal Corporation (formerly Allerting Communicators of America and Biersach & Niedermeyer Co.) from 1944 until 1980. It has a distinctive design with the chopper in the bottom horn and the noise coming out of the top horn.
==History==
The ACA Allertor was originally designed in the early 1940s as the B&N (Biersach & Niedermeyer Co.) Mobil Directo and was used for air raid warnings during World War II. The Mobil Directo was made of metal. It came in 4 different port ratios. 8, 8/12, 9/12, and 10/12, with 9/12 being the most common. The siren could reach up to 125db, hence the name "ACA Allertor 125". The 9/12 and 10/12 rotors were derived from Federal Signal Corporation. In 1968, during the height of the cold war, B&N changed their name to ACA (Allerting Communicators of America) and changed the Mobil Directo to the Allertor. Many designs were changed, such as the Mobil Directo having an exposed motor and a belt-driven rotator, and the Allertor having a covered motor and a chain-driven rotator. During the early 1970s, the Allertor was changed from metal to fiberglass and the bottom horn was made larger to reduce snow intake to the rotor. The ACA Allertor was a popular choice for a warning siren in the Midwest during the 1960s and 1970s. The siren was mainly used for air raid warnings (during the Cold War) and weather warnings (after the Cold War). The ACA Allertor 125's production stopped around 1980, when it as replaced with the more efficiently designed Penetrator 10. Unfortunately, these sirens are becoming more uncommon due to their age and because of newer technology.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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