Embrazures are openings cut through parapets, flanks of bastions, &c., for guns to fire through.
The neck of the embrazure is the inward, or narrowest part of it.
The mouth of the embrazure is the outward, or widest part of it.
The sole of the embrazure is the bottom, or space, between the cheeks or sides.
The sill is the front of the sole.
The genouillere is that part of the parapet which is immediately beneath the embrazures.
The merlon is the portion of the parapet contained between two embrazures.
The following dimensions are requisite to be proof,
| Against musketry.— | 3 feet | when of | earth. |
| 6 inches | ” | stone. | |
| 12 inches | ” | fir. | |
| 5 inches | ” | oak. | |
| 9 inches | ” | brick. |