This useful guide can be recommended for everybody who uses writing often and wants to improve this skill to become better.
An excerpt:
"Almost every English boy can be taught to write clearly, so far at least as clearness depends upon the arrangement of words. Force, elegance, and variety of style are more difficult to teach, and far more difficult to learn; but clear writing can be reduced to rules. To teach the art of writing clearly is the main object of these Rules and Exercises.
Ambiguity may arise, not only from bad arrangement, but also from other causes—from the misuse of single words, and from confused thought. These causes are not removable by definite rules, and therefore, though not neglected, are not prominently considered in this book. My object rather is to point out some few continually recurring causes of ambiguity, and to suggest definite remedies in each case. Speeches in Parliament, newspaper narratives and articles, and, above all, resolutions at public meetings, furnish abundant instances of obscurity arising from the monotonous neglect of some dozen simple rules..."