Public domain texts are a really good place to read regarding your favorite topics at no cost. Here are some examples I have run across (about engineering), from various eras.
"The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed." Written in the 1800s.
From CHAPTER IV:
"Besides the plain capital thus described, of which instances with the
single escalloped edge occur in the crypts beneath the cathedrals of
Canterbury, Winchester, and Worcester, and with a series of escalloped
edges, or what would be heraldically termed _invected_, in many of the
capitals of the Norman piers in Norwich Cathedral, an extreme variety of
design in ornamental accessories prevail, the general form and outline of
the capital being preserved; and some exhibit imitations of the Ionic
volute and Corinthian acanthus, whilst many are covered with rude
sculpture in relief. They are generally finished with a plain square
abacus moulding, with the under edge simply bevelled or chamfered;
sometimes a slight angular moulding occurs between the upper face and
slope of the abacus, and sometimes the abacus alone intervenes between the
pier and the spring of the arch. There are also many round capitals, as,
for instance, those in the nave of Gloucester Cathedral, but they are
mostly late in the style."
The second comes from Rural Architecture, Being a Complete Description of Farm Houses, Cottages, and Out Buildings. By Allen, Lewis Falley. Also written in the 1800s.
"Intimately connected with this subject, in rural buildings, is the
_shape_ of the structure. Many of the designs recently introduced for
the imitation of builders, are full of angles and all sorts of zig-zag
lines, which, although they may add to the variety of style, or relieve
the monotony of straight and continuous lines, are carried to a needless
excess, expensive in their construction, and entail infinite trouble
upon the owner or occupant, in the repairs they subject him to, in the
leakages continually occurring, against which last, either of wind or
rain, it is almost impossible to guard. And what, let us ask, are the
benefits of a parcel of needless gables and peaked windows, running up
like owl's ears, above the eaves of a house, except to create expense,
and invite leakage and decay? If in appearance, they provoke an
association of that kind, they certainly are not in good taste; and a
foot or two of increased height in a wall, or a low window sufficient
for the purpose intended, would give a tone of dignity, of comfort, and
real utility, which a whole covey of such pretentious things could not.
All such trumpery should be scouted from the dwelling house of the
farmer, and left to the special indulgence of the town builder."
You can get many more works at Project Gutenberg.
Other extracts:
Architecture Related Prints"Ancient" Public Domain WritingsOld Public Domain Books