In the commoner buildings these may be of rubble; but they are more frequently of cut stone even in rubble walling They are generally formed with reveals, as explained at page 10, the thickness of stone in front of the check, or sinking for the frame, varying from 6 to 12 inches.

It is important to secure a good bond in the jambs of all openings; every header should go right through the thickness of the wall, the alternate stones stretching along the face.3

Fig. 142. Stone Jamb with Reveal.

Fig. 142. Stone Jamb with Reveal.

1 Weathering is dressing off the upper surface of a stone to a slight slope, in order that the rain may not rest upon it.

2 Throating is cutting a groove or throat on the under side of that part of a stone which projects over a wall, in order that the water trickling over the face of the stone may be stopped before it reaches the wall.

3 Sc. Inbonds and Outbonds.

The stones forming the jambs - ("jambstones"1) may be chamfered, moulded on the outer angles, or ornamented in different ways to suit the style of the building.

To save expense, architraves 2 or other ornamental mouldings are often worked separately in thin strips, or stuck up on edge round the door or window opening to be ornamented.

In other cases the jambs each consist of one long stone on end, the height of the opening, with the architrave worked upon it.