Building. [f. THROUGH prep. + STONE sb.] A stone placed so as to extend through the thickness of a wall; a bond-stone.
1805. Dickson, Pract. Agric., I. 112. Long stones should … be selected for the purpose of being placed occasionally across the wall, in order to bind it well together. These are termed throughs, or through stones.
1825. J. Nicholson, Operat. Mechanic, 538. In each course of ashlar facing … thorough-stones should occasionally be introduced.
1879. Cassell’s Techn. Educ., II. 98. Thorough-stones or bond-stones.
1893. C. Hodges, in Reliquary, Jan., 9. The side walls … are built of large stones, as wide as the walls are thick, i.e. they are all through stones.
