Paragraf tamamlamaSoru #9695
The invention of the chronometer by John Harrison in the 18th century solved the greatest navigational challenge of the maritime age: calculating longitude at sea. While latitude could easily be determined by measuring the angle of the sun or Polaris above the horizon, longitude required comparing local solar time with a precise reference clock set to a prime meridian. ----. Without a mechanism immune to ship motion and temperature fluctuations, ships routinely wrecked along jagged reefs.
- A)Harrison's timepieces were constructed entirely of polished glass to prevent salt spray corrosion
- B)British naval admirals had already mapped every oceanic meridian with astronomical quadrants decades earlier
- C)Sailors preferred relying on stellar occultation tables compiled by royal Greenwich astronomers
- D)However, conventional pendulum clocks were rendered utterly useless by the rolling swell of ocean waves and varying barometric pressure
- E)Most merchant vessels carried compasses that automatically corrected for local longitudinal deviations
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Doğru cevap: D) However, conventional pendulum clocks were rendered utterly useless by the rolling swell of ocean waves and varying barometric pressure
Çözüm: Neden hassas bir referans saate ihtiyaç duyulduğu ve sonraki cümlede geçen "Without a mechanism immune to ship motion..." ifadesi, sarkaçlı saatlerin gemide işe yaramadığını belirten D seçeneğiyle doğrudan tamamlanır.