The Portland Horn™ - A Description
In the foreground you can see The Portland Horn™. It consists of a large black diaphragm, held in situe by a clamp. Compressed air is used to make this diaphragm vibrate and that is how the device generates an acoustic signal. The exhaust air is vent
ed away. This ensures that the horn will operate under water without bubbles interfering with noise production.
The yellow air cylinder in the background supplies the compressed air used to activate the horn. Also in the background you can see a smaller Portland Horn™ connected to the air cylinder.
The red frame to the left and the back contains a hydraulic compressor and car battery. These are used to vary the tension across the diaphragm and in so doing vary the resonant frequency of the device. The higher the tension in the diaphragm the higher t
he frequency, the lower the tension, the lower the frequency.
The bald headed guy in the suit is the Inventor - Tim Snape
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