We do not have a way to search the copyright field specifically. But we do know that anything published in the U.S. before 1924 is public domain, so you can, using Advanced Search, put in a date range under Hymnals, such as 1700-1924. You can filter by language by entering "English" in the language field under texts, and then select result type of text or tune. You may want to sort by Matching Instances to find the more popular hymns.
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Search for public domain
We do not have a way to search the copyright field specifically. But we do know that anything published in the U.S. before 1924 is public domain, so you can, using Advanced Search, put in a date range under Hymnals, such as 1700-1924. You can filter by language by entering "English" in the language field under texts, and then select result type of text or tune. You may want to sort by Matching Instances to find the more popular hymns.