The original spelling, hyphenation, and punctuation have been retained,
with the exception of apparent typographical errors which have been
corrected.
Ambiguous hyphens at the ends of lines were retained.
Punctuation and spelling were made consistent when a predominant
form was found in this book; otherwise they were not changed.
Mid-paragraph illustrations have been moved between paragraphs
and some illustrations have been moved closer to the text that
references them. The list of Illustrations paginations were
changed accordingly.
Other corrections:
p. 13: Frustrom → frustum (… a frustum of a cone….)
p. 75: dorm → form (The form is then raised….)
p. 78: staple → stable (… make a stable, compact pile….)
p. 109: Plate 40a re-numbered to 41e.
p. 116: Plate 41a re-numbered to 41f.
p. 120: Plate 41 re-numbered to 42.
p. 126: machacoulis → machicoulis (Machicoulis gallery in background.)
p. 127: he → be (Loopholes should be screened….)
p. 155: he → be (… tasks that will be demanded of them.)