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A whistle is an instrument which produces sound from a stream of gas, most commonly air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.

Whistles have been around since early humans first carved out a gourd or branch and found they could make sound with it. In prehistoric Egypt, small shells were used as whistles.[1] Many present day wind instruments are inheritors of these early whistles. With the rise of more mechanical power, other forms of whistles have been developed.[2]

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One characteristic of a whistle is that it creates a pure, or nearly pure, tone. The conversion of flow energy to sound comes from an interaction between a solid material and a fluid stream. The forces in some whistles are sufficient to set the solid material in motion. Classic examples are Aeolian tones that result in galloping power lines, or the Tacoma Narrows Bridge (the so-called "Galloping Gertie" of popular media). Other examples are circular disks set into vibration.[3]

Whistles made of bone or wood have been used for thousands of years.[2] Whistles were used by the Ancient Greeks to keep the stroke of galley slaves. Archaeologists have found a terracotta whistle at the ruins of the ancient Greek city of Assos, most probably a child's toy placed in a child's grave as a burial gift.[4]The English used whistles during the Crusades to signal orders to archers. Boatswain pipes were also used in the age of sail aboard naval vessels to issue commands and salute dignitaries.

In 1883, he began experimenting with pea-whistle designs that could produce an intense sound that could grab attention from over a mile away. His invention was discovered by accident when he dropped his violin and it shattered on the floor. Observing how the discordant sound of the breaking strings travelled (trill effect), Hudson had the idea to put a pea in the whistle.[6] Prior to this, whistles were much quieter and were only thought of as musical instruments or toys for children. After observing the problems that local police were having with effectively communicating with rattles,[7][8] he realised that his whistle designs could be used as an effective aid to their work.[6][9]

Hudson demonstrated his whistle to Scotland Yard and was awarded his first contract in 1884. Both rattles and whistles were used to call for back-up in areas where neighbourhood beats overlapped, and following their success in the Metropolitan Police of London, the whistle was adopted by most police forces in the United Kingdom.[6]

During World War I, officers of the British Army and United States Army used whistles to communicate with troops, command charges and warn when artillery pieces were going to fire.[10][11] Most whistles used by the British were manufactured by J & Hudson Co.[10]

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How can such a "happy" sound trigger such aggravation and sometimes even panic or rage in you? If you experience a highly intense emotion when people whistle, hum, crack their knuckles, bite their fingernails, tap a pencil, you may have Misophonia. It's a real thing folks, and if you have it, you're not alone. Most importantly, you're not crazy and you're not mean.

Those people who work in an office and hum or whistle clearly have zero regard for those around them who are trying to focus. The same is true if they have headphones on but are singing out loud or have their radio on to a volume that anyone else can hear.

Moral of the story, please don't hum and whistle in public, and don't whistle while you work. Be courteous to those around you and remember, it might not just annoy a bystander, it might be causing them great emotional distress.

Where it all started the World's first sports whistle, used by every generation since 1884 and still appearing in World sport finals every year. The contemporary ACME Thunderer sports whistle is available in 8 different versions for every sport and every use. Totally consistent and reliable all-weather whistles.

There are currently eight different types of ACME Thunderer that make up the range. The main difference between the models is the overall size of the whistle or the width and length of the mouthpiece; by varying the size of the whistle and mouthpiece it is possible to achieve different sounds, tones and volumes. Generally, a larger whistle will have a louder and deeper sound than a smaller whistle, and by elongating and flaring the mouthpiece of some models, a very loud and high pitched sound can be created, whereas by tapering the mouthpiece, a deeper sound can be achieved.

The unique design of this three chamber pealess whistle emits a high-pitch, loud and shrill tone. Ideal for lifeguards, lifeguard instructors, water safety personnel, referees, and teachers. No pea to become stuck and inhibit whistle sound

You only use the cap of the acorn to whistle with--not the whole acorn. You will have to remove a cap from the rest of an acorn. Although acorn whistling is simple once you have done it, you will have to experiment at it a bit to learn it. Larger caps are easier to learn on, while smaller ones seem to be slightly louder.

If, due to the presence of obstructions, the sound field of a single whistle or of one of the whistles referred to in paragraph (f) of this section is likely to have a zone of greatly reduced signal level, a combined whistle system should be fitted so as to overcome this reduction.

The compact size of approximately {2.25 in | 5.7 cm} across the main body allows this safety device to easily be tucked away during your dives when not in use. The safety whistle performs in all conditions and in any weather or safety situation and in any position. When blown on land it can be audible up to 1/2 mile to signal the boat. Underwater it can be audible for up to 50 feet to signal your wandering buddy or others. It includes a stainless split ring with "S" bend and an approximate diameter of {.75 in | 1.9 cm}.

A high-impact, marine grade and non-corrosive thermoplastic housing is easy to grasp even with gloves. The patented double chamber design allows it to be used when held right side up or upside down, forcing all water to be purged when the whistle is blown. No matter what your location or position it will work when needed!

Question: I am trying to train my black lab to whistle sit. She sits when she is close to me with it, but wont sit part way out for a retrieve. I have been working more on blind retrieves in hopes it will help build confidence. Is there any other tips/tricks i can use? She's my first dog so i have learned a lot of do's and don'ts so far. Thank you so very much!

Answer: There is a lot here and I'll have to make a few assumptions but will do my best to help. First off, I think sequence in training is very important. You can't do some things with retrievers if you're missing tools. I have a general idea of the direction I am going with my dogs and understand that need for certain tools (skills) in order to accomplish them. Sit to the whistle is something that I think is somewhat foundational. It's an extension of sit, and serves as a good tool of control. Once this is established, it can be use in sequence with things like handling of the dog at a distance. That being said, blind retrieves are something I don't do until my dog is handling well. Handling (left, right and back) is something that takes place in the yard under very controlled setups. The stop/sit to the whistle has to be there before I can do any of those drills. So, what I'm saying is that I think your sequencing is likely off as far as having the dog ready for a lot of what you're trying to accomplish which is likely the reason for your struggles.

So, backing up and talking specifically on sit to the whistle...I make sure that I can stop the dog coming to me reliably at short distance to start and then adding on gradually in difficulty both distance and with "distractions". Before I ever try stopping a dog going away, coming to me has to be 100%. So, recall and sit to the whistle long before sending on a retrieve and asking to sit to the whistle is one thing I make sure of. I eventually will reward the sit to whistle coming at me with a dummy thrown overhead and then a back command. That means the dog has to understand "back" which is something I make sure to have built in beforehand. Once the dog is doing that and I make the switch to trying to stop the dog going away from me, I make sure to do it on a very small scale. I might send the dog and stop them just a few feet away. As long as they do it well, I quickly send them back for the retrieve as the reward.

As a recap...in order to do these drills the dog needs to understand how to stop to the whistle in close (on heel to start) then at a distance. It needs to understand "back". It needs to be very steady. It needs perfect recall. It needs perfect off lead heel. It needs perfect delivery. There is a lot of building blocks that need to be there in order to be where you are trying to get. Is that all there?

Beginning today, Georgia Tech students and all inhabitants in the City of Atlanta will no longer be awoken early in the morning with the piercing, yet iconic, sound of the steam whistle. Due to a new ordinance by the Federation of Operational Linguistics and Sounds (FOOLS), all public sounds aired in non-closed areas must be at a frequency either below 20,000 Hz or above 35,000 Hz.

The news of the change has started to reach native Atlantans, and the response is not expected to just blow over. John Rackett is one Yellow Jacket alumnus that is steamed about the ordinance. A 16-year resident in midtown, the whistle has remained a part of his daily routine. 006ab0faaa