Antique Car or Truck Double Trumpet Air Horns 1930 - 1940s - RARE collectible - Untested -- Sold As Is - Measures 21" Length ... Valuable estate sale discovery great collectible  ... FREE SHIPPING 
 
Double trumpet air horns were a popular accessory for cars and trucks in the 1930s. They were typically made of brass or chrome, and they were mounted on the front of the vehicle. The horns were powered by a compressor, and they produced a loud, distinctive sound.
 
Double trumpet air horns were often used by motorists to warn other drivers of their presence, or to get attention in an emergency situation. They were also sometimes used by police cars and ambulances.
 
Double trumpet air horns were a popular status symbol in the 1930s, and they were often found on expensive cars and trucks. They were also popular among hot rodders and custom car enthusiasts.
 
Here is a more detailed description of double trumpet air horns from the 1930s:
They were typically made of brass or chrome.
They were mounted on the front of the vehicle, often on the fenders or grille.
They were powered by a compressor, which was usually mounted in the engine compartment.
They produced a loud, distinctive sound, which was often described as a "honk" or "blast."
They were used by motorists to warn other drivers of their presence, or to get attention in an emergency situation.
They were also used by police cars and ambulances.
They were a popular status symbol in the 1930s, and they were often found on expensive cars and trucks.
They were also popular among hot rodders and custom car enthusiasts.
 
Today, double trumpet air horns are still popular among some car and truck enthusiasts. They are also sometimes used on boats and other vehicles.