Tone Variations
- By placing a second stator over the main stator and attaching a solenoid to it, one can repeatedly close and open all of the stator ports thus creating a tone called a pulse. If this is done while the siren is wailing (rather than sounding a steady tone) then it is called a pulse wail.
- By doing this separately over each row of ports on a dual tone siren, one can alternately sound each of the two tones back and forth, creating a tone known as Hi/Lo. If this is done while the siren is wailing, it is called a Hi/Lo wail. This equipment can also do pulse or pulse wail.
- Using the same equipment as Hi/Lo or Pulse, one can manually open the stator ports for short dits and long dahs as in Morse code. A siren which can do both pulse and Morse code is known as a code siren.
Famous quotes containing the words tone and/or variations:
“We often contradict an opinion when it is actually only the tone with which it was put forward that is uncongenial to us.”
—Friedrich Nietzsche (1844–1900)
“I may be able to spot arrowheads on the desert but a refrigerator is a jungle in which I am easily lost. My wife, however, will unerringly point out that the cheese or the leftover roast is hiding right in front of my eyes. Hundreds of such experiences convince me that men and women often inhabit quite different visual worlds. These are differences which cannot be attributed to variations in visual acuity. Man and women simply have learned to use their eyes in very different ways.”
—Edward T. Hall (b. 1914)
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