On the Construction of Engines of War (Belopoeeca)

XIX The Roman numeral for nineteen.

HER. S. L. original: "HER. S. L." Likely a Latin or German administrative abbreviation denoting a specific section of the library or a series title.

Soon original: "Bald." In German, this word means "soon," potentially indicating an incomplete entry or a placeholder; however, in a library context, it may also refer to a proper name of a scholar or cataloger.

XIX The number nineteen, frequently used in archival settings to mark the sequence of volumes within a larger collection.
HER. S. L. An archival shorthand, possibly used to classify the manuscript by subject or to indicate its provenance from a specific legacy collection.
Soon A translation of the German "Bald," appearing here as a handwritten notation, possibly a memo for future cataloging work.