Reminds me of the Suez Canal Authority requirements. All ships passing through the Suez Canal require an approved 'Suez Canal Searchlight'. Any ship not having one, or whose searchlight was deemed on inspection not to comply, had to hire a searchlight from the Authority. Among the requirements were two interesting ones: "The enclosure must be gas-tight" and "The enclosure must be provided with a drain hole at the bottom".
Reminds me of the Suez Canal Authority requirements. All ships passing through the Suez Canal require an approved 'Suez Canal Searchlight'. Any ship not having one, or whose searchlight was deemed on inspection not to comply, had to hire a searchlight from the Authority. Among the requirements were two interesting ones: "The enclosure must be gas-tight" and "The enclosure must be provided with a drain hole at the bottom".
