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To make an arched fireplace opening make the top of the arch tangent with the bottom of the rounded Rumford throat. Then where the arch drops below the throat at each side* fill those pockets with mortar or plaster and feather into the throat so as to make a smooth, streamlined, compound curved throat out of our simple curved throat. _____ * Called the "voussoir" as John Walkup in North Carolina pointed out.

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