Note 8 — GLOSSARY.
Reading edition
It "meant a certain species of aperture, generally circular, which used to be common in the stair-cases of old wooden houses in Scotland, and some specimens of which are yet to be seen in the Old Town of Edinburgh. It was calculated to save glass in those parts of the house where light was required, but where there was no necessity for the exclusion of the air."—Chambers.
Not always certainly, since persons are sometimes said to be lying at the shot window.