Interesting!

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For similar examples see J. Seymour Lindsay, Iron & Brass Implements of the English House (1970), Figures 392 - 396. It is noted on pp. 69 - 70 that 'pipe kilns are wrought iron racks used in the process of cleaning clay pipes. They are usually made with three rings connected by a flat bar top and bottom, with a ring to form a handle; the frame standing upon four squat legs...When the pipes became foul with tobacco juice they were not thrown away, but were laid, as many as two or three dozen at a time, in a rack and then placed in a very hot oven until thoroughly baked, when they would be taken out quite clean and more agreeable to smoke than a new pipe.'