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What (who) is cylindrical hydrophone - definition

MAP PROJECTION

Miller projection; Miller cylindrical; Miller Cylindrical; World Miller Cylindrical; Miller cylindrical map projection

hydrophone

UNDERWATER MICROPHONE

Underwater microphone; Hydrophones; Hydrophone(s)

¦ noun a microphone which detects sound waves under water.

Hydrophone

UNDERWATER MICROPHONE

Underwater microphone; Hydrophones; Hydrophone(s)

A hydrophone () is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave.

https://en.wikipedia.org/wiki/Hydrophone

Cylindrical drum

CLASS OF MUSICAL INSTRUMENTS

Cylindrical drums are a category of drum instruments that include a wide range of implementations, including the bass drum and the Iranian dohol. Cylindrical drums are generally two-headed and straight-sided, and sometimes use a buzzing, percussive string.

https://en.wikipedia.org/wiki/Cylindrical_drum

Wikipedia

Miller cylindrical projection

The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942. The latitude is scaled by a factor of 4⁄5, projected according to Mercator, and then the result is multiplied by 5⁄4 to retain scale along the equator. Hence:

or inversely,

where λ is the longitude from the central meridian of the projection, and φ is the latitude. Meridians are thus about 0.733 the length of the equator.

In GIS applications, this projection is known as: "ESRI:54003 – World Miller Cylindrical".

Compact Miller projection is similar to Miller but spacing between parallels stops growing after 55 degrees.

https://en.wikipedia.org/wiki/Miller cylindrical projection