Types of Air Whistles
Hancock offered three different models of their air whistle. The most common was the 4700, which consisted of the whistle along with a large, rectangular bowl in the same plane as the languid plate. This bowl, or reflector, is used to project the sound of the whistle ahead of the locomotive, instead of omnidirectional as in the case of most whistles. The second model was the 4700-2. This whistle is basically the same as the 4700 except that it has an electric heating element installed in the bowl to keep it from freezing. The final offering was the H4700, which did not include the reflector bowl. Aside from this difference, it is basically identical to the 4700.
The Hancock air whistles were all designed so that the bell of the whistle is horizontal when mounted on a standard horn mount. All the whistles are a single-bell chime, playing the notes E A C# (A major triad) when blown on air. However, over time, many of the whistles got off-key and produced some variants. One common chord was E A D.
Read more about this topic: Hancock Air Whistle
Famous quotes containing the words types of, types, air and/or whistles:
“The wider the range of possibilities we offer children, the more intense will be their motivations and the richer their experiences. We must widen the range of topics and goals, the types of situations we offer and their degree of structure, the kinds and combinations of resources and materials, and the possible interactions with things, peers, and adults.”
—Loris Malaguzzi (1920–1994)
“If there is nothing new on the earth, still the traveler always has a resource in the skies. They are constantly turning a new page to view. The wind sets the types on this blue ground, and the inquiring may always read a new truth there.”
—Henry David Thoreau (1817–1862)
“The air deals blows: surely too hard, too often?
No: it is bent on bringing summer down.
Dead leaves desert in thousands, outwards, upwards,
Numerous as birds; but the birds fly away....”
—Philip Larkin (1922–1986)
“In trying to understand the appeal of best-sellers, it is well to remember that whistles can be made sounding certain notes which are clearly audible to dogs and other of the lower animals, though man is incapable of hearing them.”
—Rebecca West (1892–1983)