1844 7 246/2 The striking-wedges were of seasoned oak, well greased.
1845 P. Barlow Manuf. in VIII. 95/2 This acting upon the surface of the striking wedges equal to 540 square feet gives a pressure of 140 pounds per square inch.
1876 IV. 311/2 Figure 55 shows the striking plates and wedges by which the centre is lowered after the completion of the arch.