seventy-to

Updated: September 2, 2026

A balloon was built 184 feet in length and 52 feet in diameter, and was driven by a seventy-to eighty-horse-power motor. A curious feature of this craft was the guide rope or, as Wellman called it, the equilibrator, which was made of steel, jointed and hollow.

Willis J. (Willis John) Abbot - Aircraft and Submarines: The Story of the Invention, Development, and Present-Day: Uses of War's Newest Weapons