Furnace vents, perhaps

Usage examples of gratings.

We were standing by the gratings abaft the mainmast, and at that moment a stout elderly man, in a uniform much like Bligh's, came purring up the ladderway.

Churchill, the master-at-arms, stood by my hammock with a pistol in his hand, and I saw Thompson, holding a musket with the bayonet fixed, stationed by the arms chest which stood on the gratings of the main hatch.

Had Thénardier, illuminated by that fearful thirst for liberty which changes precipices into ditches, iron gratings into osier screens, a cripple into an athlete, an old gouty into a bird, stupidity into instinct, instinct into intelligence, and intelligence into genius, had Thénardier invented and extemporised a third method?

The sounds of doors opening and shutting, the grinding of gratings upon their hinges, the tumult in the guard-house, the harsh calls of the gate-keepers, the sound of the butts of muskets upon the pavement of the yards reached him.

These gratings therefore inexorably turned upon their hinges the instant the sun disappeared behind the dome of the Invalides.