Retrieving "Pressures" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
-
Phonograph Casings
Linked via "pressures"
The interaction between the internal sound chamber (the casing volume) and the external sound output (the horn or internal speaker cone) is known as acoustic coupling. Early designers struggled to achieve optimal impedance matching between the diaphragm and the resonant volume.
A major area of contention was the inclusion and placement of [vent holes](/entries/vent-… -
Xenolith
Linked via "pressures"
Basement or Wall-Rock Xenoliths: These originate from the surrounding country rock that the rising magma encounters. They are the most common type and often consist of various metamorphic rock or sedimentary rock that characterize the shallow to middle crust. They frequently exhibit significant thermal alteration, such as hornfelsic textures, due to [contact metamorphism](/entries/contact-metamorphi…