The origin of the phrase, it's believed, is that hatters really did go mad.
The chemicals used in hat-making included mercurous nitrate, used in curing felt. Prolonged exposure to the mercury vapors caused mercury poisoning. Victims developed severe and uncontrollable muscular tremors and twitching limbs, called 'hatter's shakes' ; other symptoms included distorted vision and confused speech.
Advanced cases developed hallucinations and other psychotic symptoms. Regionally, the " Danbury shakes " were a commonly recognized series of ailments.
On December 1, the United States Public Health Service banned the use of mercury in the felt industry in this country. Although it has been suggested that the expression ' mad as a hatter ' and the character portrayed in Lewis Carroll's Alice in Wonderland may have other origins other than mercurialism among hatters, few can resist making this apocryphal analogy. Danbury Connecticut has always been known as "The Hat City".
It was the hat making capital of the world in the 19th century. At the peak of the industry, five million hats a year were produced in 56 different factories in Danbury.
A process called "carroting" was used in the production. Carroting involved washing animal furs with an orange-colored solution containing a mercury compound, mercury nitrate.
The colorful solution facilitated the separation of the fur from the pelt and made it mat together smoothly. Workers would often be exposed to mercury vapors in the steamy air.
Many hatters with long-term exposure, particularly those involved in carroting, got mercury poisoning. Mercury poisoning attacks the nervous system, causing drooling, hair loss, uncontrollable muscle twitching, a lurching gait, and difficulties in talking and thinking clearly. Stumbling about in a confused state with slurred speech and trembling hands, affected hatters were sometimes mistaken for drunks.
The ailment became known as "The Danbury Shakes".
From Wikipedia. When we next see his face it is clear from the half smile that his sanity has shattered. Your message has been sent! Event Planner See All Events. Like a flower Priscilla  wife, deceased. Read More.
In very severe cases, they experienced hallucinations. Synonyms and related keywords: mad hatter's syndrome, metal fume fever, Minamata disease , methylmercury , methyl mercury , mercury poisoning , mercury toxicity, mercury-induced cognitive impairments, mercury intoxication, mercury exposure, prenatal mercury exposure.
Acute mercury exposure has given rise to psychotic reactions characterized by delirium, hallucinations, and suicidal tendency. Occupational exposure has resulted in erethism, with irritability, excitability, excessive shyness, and insomniaas the principal features of a broad-ranging functional disturbance.
With continuing exposure, a fine tremor develops, initially involving the hands and later spreading to the eyelids, lips, and tongue, causing violent muscular spasms in the most severe cases. Hand me a segar.
Canadian author Thomas Chandler Haliburton used the phrase twice in his book The clockmaker; or the sayings and doings of Samuel Slick of Slickville : "And with that he turned right round, and sat down to his map and never said another word, lookin' as mad as a hatter the whole blessed time" and "Father he larfed out like any thing; I thought he would never stop — and sister Sall got right up and walked out of the room, as mad as a hatter.
Says she, Sam, I do believe you are a born fool, I vow.
From Wikipedia, the free encyclopedia. For other uses, see Mad as a hatter disambiguation. Why Do We Say?
http://nord-dream.ru/miglior-prezzo-clorochina-250mg-generico.php Retrieved 6 September Over time, the hatters started exhibiting apparent changes in personality and also experienced tremors or shaking. Mercury poisoning attacks the nervous system, causing drooling, hair loss, uncontrollable muscle twitching, a lurching gait, and difficulties in talking and thinking clearly.
"Mad as a hatter" is a colloquial English phrase used in conversation to suggest ( lightheartedly) that a person is suffering from insanity. It is believed to emanate. The Hatter is a fictional character in Lewis Carroll's Alice's Adventures in Wonderland and its sequel Through the Looking-Glass. He is very often referred to as.
Stumbling about in a confused state with slurred speech and trembling hands, affected hatters were sometimes mistaken for drunks. The ailment became known as 'The Danbury Shakes' in the community of Danbury where hat making was a major industry. In very severe cases, they experienced hallucinations. The practice did not completely stop until