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The Warnerke Standard Sensitometer consisted of a frame holding an opaque screen with an array of typically 25 numbered, gradually pigmented squares brought into contact with the photographic plate during a timed test exposure under a phosphorescent tablet excited before by the light of a burning Magnesium ribbon. The speed of the emulsion was then expressed in 'degrees' Warnerke (sometimes seen as Warn. or W.) corresponding with the last number visible on the exposed plate after development and fixation. Each number represented an increase of 1/3 in speed, typical plate speeds were between 10 and 25 Warnerke at the time.

How much speed is associated with each degree Warnerke?
Answer: an increase of 1/3 in speed
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The Medieval period includes music from after the fall of Rome to about 1400. Monophonic chant, also called plainsong or Gregorian chant, was the dominant form until about 1100. Polyphonic (multi-voiced) music developed from monophonic chant throughout the late Middle Ages and into the Renaissance, including the more complex voicings of motets.

When did Monophonic chant stop being the dominant form?
Answer: 1100
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On 2 March 1977 the General People's Congress adopted the "Declaration of the Establishment of the People's Authority" at Gaddafi's behest. Dissolving the Libyan Arab Republic, it was replaced by the Great Socialist People's Libyan Arab Jamahiriya (Arabic: , al-Jamahiriyah al-'Arabiyah al-Libiyah ash-Sha'biyah al-Ishtirakiyah), a "state of the masses" conceptualized by Gaddafi. Officially, the Jamahiriya was a direct democracy in which the people ruled themselves through the 187 Basic People's Congresses, where all adult Libyans participated and voted on national decisions. These then sent members to the annual General People's Congress, which was broadcast live on television. In principle, the People's Congresses were Libya's highest authority, with major decisions proposed by government officials or with Gaddafi himself requiring the consent of the People's Congresses.

How often did the General People's Congress occur?
Answer:
annual