Science Fair Project Encyclopedia
The interior walls behind an arrow slit are often cut away at an oblique angle so that the archer has a wide field of view and field of fire; alternatively, or additionally, the arrow slit may be in the form of a cross. The thin vertical aperture permits the archer large degrees of freedom to vary the elevation and direction of his bowshot but makes it difficult for attackers to harm the archer because there is only a small target to aim at.
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