Federal Signal Model 2
The Federal Signal Model 2 is an omnidirectional outdoor warning siren produced by Federal Signal Corporation.
Siren information and history
The Model 2 features a 2 HP universal motor powering a single-tone 5-port chopper, which was also used on the Thunderbolt 1000, another siren once made by Federal Signal. It can produce 3 signals at 102 dBC:- Alert
- Fire
- Attack
It features a 100% sheet metal enclosure with polyester powder-coated paint. Protective mesh screens are mounted on the siren's three openings to keep out birds and debris.
The Model 2 was first introduced in approximately 1907 alongside the Fedelcode line of sirens, replacing the antiquated and lackluster Type B. The first design of the Model 2 featured 3 louvers, 2 on top and 1 on the bottom. This design lasted until around 1953. The newer and current design has 1 louver on top and 2 on the bottom. Many early Model 2 units are known as "Long Legged" Model 2s.They were called this because the mounting legs that bolted to the motor were rather tall, at roughly 9 or 10 inches tall. It is also worth noting the Long Legs lacked the intake cone and stator ring for stabilizing the housing that newer sirens feature. The long leg sirens were predominately single tone, yet some dual tones have shown up, such as the example in New Orleans, LA that is pictured. The long leg sirens also used 4 brushes as opposed to 2. The 4 brush setup and long legs were replaced with a short leg, two brush setup around 1953, with the version still currently produced today. Although these differences are quite noticeable, the basic formula for the Model 2 has remained constant since the first ones were built around 1907. Currently, the earliest known extant Model 2 siren dates to 1911. This siren is in private possession.
Federal had also made a coded version of the Model 2. A small motor located at the base of the siren would oscillate a gear which would move a metal shaft leading to the stator. Located at the top of the shaft was a small gear and a strip of gear teeth connected to the stator. Whenever the bottom gear oscillates back and forth, the shaft would rotate and cause the stator to open and close making a "coded" signal. The coded model was advertised as "the fastest coding siren on the market", and was supposedly able to operate fast enough to produce Morse code. The coded model 2 was in production for 19 years.