Complete the sentence about Raffles Lighthouse with the correct year: In ______, the installation of a 4th Order electrically operated revolving optic replaced the original 2nd Order optic with a pressurised vapour kerosene "Hood" mantle burner.
Answer and explanation
Correct answer: D. 1968
In 1968 a 4th Order electrically powered revolving optic replaced the original 2nd Order optic. A crew of seven had been needed earlier.
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