About: Siren disk

An Entity of Type: Thing, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org

A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk." The pitch is therefore determined by the speed at which the disk rotates, the number of holes which air passes through, the size of the holes and their spacing apart.

Property	Value
dbo:abstract	A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk." The pitch is therefore determined by the speed at which the disk rotates, the number of holes which air passes through, the size of the holes and their spacing apart. (en)
dbo:thumbnail	wiki-commons:Special:FilePath/Hypothetical_siren_disk.png?width=300
dbo:wikiPageID	3403726 (xsd:integer)
dbo:wikiPageLength	3992 (xsd:nonNegativeInteger)
dbo:wikiPageRevisionID	779171947 (xsd:integer)
dbo:wikiPageWikiLink	dbr:Minor_scale dbr:Harmonic_series_(music) dbr:Pitch_(music) dbr:Major_scale dbc:Sound_production dbr:Just_intonation dbr:Audio_frequency dbc:Rotating_and_whirling_aerophones dbr:Pneumatic dbr:Ontario_Science_Centre dbr:Ptolemy's_intense_diatonic_scale dbr:Siren_(noisemaker) dbr:File:Hypothetical_siren_disk.png dbr:File:Sirendisk_notes.640.png
dbp:date	August 2014 (en)
dbp:reason	What is meant by "further"? More holes or more space between holes? (en)
dbp:wikiPageUsesTemplate	dbt:Citation_needed dbt:Clarification_needed dbt:Refimprove dbt:Reflist dbt:Aerophones
dct:subject	dbc:Sound_production dbc:Rotating_and_whirling_aerophones
rdfs:comment	A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk." The pitch is therefore determined by the speed at which the disk rotates, the number of holes which air passes through, the size of the holes and their spacing apart. (en)
rdfs:label	Siren disk (en)
owl:sameAs	freebase:Siren disk wikidata:Siren disk https://global.dbpedia.org/id/4updy
prov:wasDerivedFrom	wikipedia-en:Siren_disk?oldid=779171947&ns=0
foaf:depiction	wiki-commons:Special:FilePath/Hypothetical_siren_disk.png wiki-commons:Special:FilePath/Sirendisk_notes.640.png
foaf:isPrimaryTopicOf	wikipedia-en:Siren_disk
is dbo:wikiPageWikiLink of	dbr:Casquets_lighthouses dbr:Siren_(alarm) dbr:Hornbostel–Sachs dbr:Hydraulophone
is foaf:primaryTopic of	wikipedia-en:Siren_disk