Electric sirens Warn Paris of Air Raids

Titolo: Electric sirens Warn Paris of Air Raids
Oggetto: en Technology; en Communication; en Anti-aircraft
Article Title and/or Image Caption: Electric sirens Warn Paris of Air Raids; Caption 1: This Gigantic Electric Siren, Installed on the Tower of Notre Dame, is but One of the Twenty -six Fixt "Aerial Alarm" Sirens Installed All Over Paris to Warn the People.; Caption 2: Paris Has Many of These Electric Sirens Installed on Chimney Tops and Other Elevated Points to Warn of Aerial Attacks.; Caption 3: A French Electric Siren of the Bierlot Vertical Type. It Is Operated By a Motor in the Base and is Provided With a Magnetic Controller at the Top, which Permits of Rapidly Opening and Closing Its Raucous Throat, So That Telegraphic Signals
Can Be Transmitted When Desired.; Caption 4: First Electric Siren Installed In New York City in the Theater District for Warning Against Aerial Attacks. Many of These Will Be Used Thruout the City.; Caption 5: Another View of the New York Electric Siren Shown In Fig. 4. It is Fitted With a Two Horsepower Motor and Can Be Heard for Two Miles.
Autore secondario: Underwood & Underwood (photo)
Lingua: eng
Copertura temporale: World War I
Data di rilascio: 1918-08
pagine: 224-225
Diritti: Public domain
Referenzia: Notre-Dame de Paris; Blériot; New York; U-boat
Archived by: Jan Ovnik
PDF pages: 10-11; Mikhail Vsemirnov; Alberto Bordignon (Supervisor)
Copertura territoriale: French Third Republic; Paris

Media: Gigantic electric siren; Electric siren; French electric siren of the Bierlot vertical type; First electric siren installed in New York City; New York electric siren; Electric sirens (pdf)