in building, those pieces of timber that lie across the rafters on the inside, to keep them from sinking in the middle of their length.

By the act of parliament for rebuilding of London, it is provided, that all purlins from 15 feet 6 inches, to 18 feet 6 inches long, be in their square 9 inches PUS [6545] PUT

and 8 inches; and all in length from 18 feet 6 inches, to 21 feet 6 inches, be in their square 12 inches and 9 inches.