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It appears that the phrase "crackpot sound" has or had a technical use in medicine. See this [http://books.google.com/books?num=100&as_brr=3&q=%22crackpot+sound%22&btnG=Search+Books Google Books] search. Three are late-1880s references to diagnosing tuberculosis, "a crackpot sound on percussion," but, interestingly, the last one is a 2001 pediatrics text that refers to a "crackpot sound" on percussing ''the head.'' [[User:Dpbsmith|Dpbsmith]] 18:43, 28 May 2007 (EDT)
It appears that the phrase "crackpot sound" has or had a technical use in medicine. See this [http://books.google.com/books?num=100&as_brr=3&q=%22crackpot+sound%22&btnG=Search+Books Google Books] search. Three are late-1880s references to diagnosing tuberculosis, "a crackpot sound on percussion," but, interestingly, the last one is a 2001 pediatrics text that refers to a "crackpot sound" on percussing ''the head.'' [[User:Dpbsmith|Dpbsmith]] 18:43, 28 May 2007 (EDT)
It's used in diagnosing hydrocephaly. [http://209.85.165.104/search?q=cache:IxezPQUpIhQJ:cppweb.bsd.uchicago.edu/Neuro/IntroMaterial/NeuroGlossary.html+%22crackpot+sound%22+percussion&hl=en&ct=clnk&cd=5&gl=us&client=safari Neurology glossary], available only in Google's cache: "Crackpot Sound on Head Percussion - This is elicited by percussing the skull with one finger and hearing a resonant sound similar to that derived from tapping a cracked porcelain pot. If the sign is elicited when the anterior fontanel is closed, it indicates increased intracranial pressure or a dilated ventricle. It is of no significance if the fontanel is open." [http://www.virtualtrials.com/shunts.cfm This page] refers to "Hydrocephalus due to aqueductal stenosis usually becomes manifest in-utero or by the first three months of infancy with typical signs of elevated intracranial pressure, bulging anterior fontanelle, splitting of the sutures, Macewan's crackpot sound to head percussion and "setting-sun sign" due to tectal compression." [[User:Dpbsmith|Dpbsmith]] 18:46, 28 May 2007 (EDT)