what does the catenarian arch represent in the royal arch and do writers agree on its meaning

The form of the Chapter symbolically approaches that of a true catenarian arch—derived from the Latin *catena*, meaning chain—which preserves a memorial of the vaulted shrine. Just as the subordinate members of a catenarian arch gravitate toward the central keystone that compresses and binds the whole structure together, Royal Arch Masons are taught to look up with reverence and cheerfully submit to lawfully constituted authority. Symbolically, the three keystones or arch stones of this structure are represented by the Three Principals of the Chapter.

While Masonic writers acknowledge these symbolic lessons of unity, authority, and reverence, they do not view the inclusion of the catenarian arch as historically authentic to the period represented in the ritual. An article on a Masonic research site points out that reference to the catenarian arch in ritual is a relatively modern addition, dating to around the 1830s or developing after Galileo's seventeenth-century study of the catenary curve. Commentators observe that the inclusion is an architectural anachronism, as ancient builders in the era of King Solomon were unacquainted with the catenarian curve. Thus, while writers agree on the moral and structural lessons drawn from the arch, they recognize that its presence in the degree represents a modern symbolic framing rather than an ancient architectural reality.

John Noorthouck was the first Masonic writer to record the term in Masonic literature, placing it in a note on page 239 of his 1784 edition of the *Book of Constitutions*, as an article on freimaurer-wiki.de records. Albert Mackey later explained that while a symbolic lodge takes the form of an oblong square, the Royal Arch Chapter according to the English Ritual takes the form of a catenarian arch 1.