"At the turn of the 19th century" and "As early as the 19th century"
You can't say "the turn of the 19th century". There is no way to tell whether you mean 1800 or 1900. You can only use "turn of the century" if we already know what year it is.
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You can't say "the turn of the 19th century". There is no way to tell whether you mean 1800 or 1900. You can only use "turn of the century" if we already know what year it is.
"As early as the 19th century" is nothing like "the turn of the century". It refers to something that we might be surprised to learn is that old.