Early lighting methods used in navigation

What was a common method used in mediaeval England to warn mariners of dangers, often maintained by religious figures? ⛪️

Difficulty: Easy

🕯️ Before the use of oil became common after the Reformation, what material was largely used to illuminate lighthouses?

Difficulty: Medium

🤔 In the late 17th century, what fuel-saving method for lighthouse lanterns was tried but ultimately failed to improve light quality?

Difficulty: Hard

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