Systems Competing with Reed-Kellogg
Sample diagrams for complex sentences, showing content clauses, infinitives, etc. (pp. 268-269)
The last page of this volume contains a plug for another book of diagrams by the same publisher: Irish's Grammar and Analysis Made Easy and Attractive by Diagrams. Given the nature of the diagrams in Harvey's Grammar, I suspect that this diagram system was cribbed from Reed and Kellogg, with enough changes to avoid copyright problems.
In E. J. Hoenshel, Hoenshel's Advanced Grammar (1899), there is a similar system that appears also to be an adaptation of Reed-Kellogg. Unlike Reed and Kellogg, the author does distinguish predicate nominatives from predicate adjectives, separating them from the verb by using an '=' for the former and a '-' for the latter.
Sample diagrams of relative clauses. (pp. 286-287)
Sample diagrams of adverbial clauses. (pp. 288-289)