Adjective clause

Definition and stakes

Frank Edgar Farley,  An Advanced English Grammar with Exercises

“ According to their use as parts of speech, subordinate clauses are adjective, adverbial, or noun clauses.
I. ADJECTIVE CLAUSES 379. A subordinate clause that modifies a substantive is called an adjective clause (§ 47) .
{Able men | Men of ability | Men who show ability} can always find employment. {Treeless spots | Spots without trees | Spots where no trees grew} were plainly visible.
In each of these groups, a noun (men, spots) is modified (1) by an adjective, (2) by an adjective phrase, (3) by an adjective clause. The sense remains unchanged.
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Source: Gutenberg

Lillian Kimball,  The structure of the English sentence (1900)

“ The unrestrictive adjective clause.—This is one that merely adds a thought to some idea already expressed. The additional thought is often valuable, but it is never necessary.—“The window of the little parlor looked down upon the water, which had made friends with its painted ceiling, and bestowed tremulous golden smiles upon it when the sun shone.”—Howells. The clause here is evidently not used to point out which water is meant, but to tell something further about the water, something unnecessary to the truth of the sentence, but valuable in giving the reader a beautiful picture. ”
Source: Gutenberg

Brainerd Kellogg,  Higher Lessons in English: A work on English grammar and composition

“ Each adjective clause is connected to insects by which. And connects the co-ordinate clauses. The second diagram shows that the clause while he tarried modifies both predicates of the independent clauses. While modifies had passed, had escaped, and tarried, as illustrated by the short lines under the first two verbs and the line over tarried. The office of while as connective is shown by the dotted lines. The third diagram illustrates the analysis of a complex sentence containing a compound noun clause.
1. Sin has a great many tools, but a lie is a handle which fits them all.
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Source: Gutenberg

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