[HN Gopher] Lithophone ___________________________________________________________________ Lithophone Author : polm23 Score : 33 points Date : 2020-02-22 05:20 UTC (17 hours ago) (HTM) web link (en.wikipedia.org) (TXT) w3m dump (en.wikipedia.org) | crazygringo wrote: | Crazy -- rocks that resonate and sound like metal! | | Unfortunately that article gives zero explanation of how certain | rocks can produce resonant tones that sound like metal, but | another one does, specifically that the rocks need to be under | internal stresses, analogous to a tightened guitar string: [1] | | "...it does suggest strongly that the ringing ability is a direct | result of internal stresses. ... A possible source of the | stresses would likely be the loading stresses from the time when | the rock crystallized. ... This "relict stress" theory implies | that the ringing rock boulders act much like a guitar string. | When a guitar string is limp it does not resonate, but a plucked | string will provide a range of sounds depending on the level of | applied tension. Likewise, a ringing rock boulder will only emit | a dull thud if the boulder is de-stressed; however, boulders will | resonate at various frequencies depending on the level of | residual stress." | | [1] https://en.wikipedia.org/wiki/Ringing_rocks#Ringing_ability | bergoid wrote: | The granite sarcophagus in the "Kings's Chamber" [1] of the Great | Pyramid of Giza has been used as a lithophone too. Paul Horn's | record album "Inside The Great Pyramid" [2] starts with the sound | of the sarcophagus being rung like a bell. | | [1] | https://en.wikipedia.org/wiki/Great_Pyramid_of_Giza#King's_C... | | [2] | https://www.youtube.com/watch?v=2ZmyGavbgLE&list=PLPtysUSalP... | James_Henry wrote: | I would advise watching some of the videos linked near the bottom | of the article and then watching some of the others on youtube. | Rocks can make beautiful noise ___________________________________________________________________ (page generated 2020-02-22 23:00 UTC)