Assertion: principal sail | /r/HasProperty | extended upon main-mast
Facets:
Source sentences:
text: All sails derive their names from the mast, yard, boom, or stay, to or upon which they are extended or attached: thus, the principal sail, extended upon the main-mast, is called the main-sail or main course; that upon the main-topmast is termed the main-topsail; that upon the main-topgallant mast is named the main-topgallant sail; and the main-topgallant royal is so called from its being spread across the upper part of the main-topgallant mast.