Rockets. Wind and weather, 331; Fortin's, _326_; meaning of, 237; principal, 238. Foci, conjugate, 262. Force, lines of, 116. Forces, component, 345. Free wheel, _440_. Furring-up of pipes, or stops. [Illustration: FIG. 166.] [Illustration: FIG. 20.] Locomotive, marine, and all other departments of France, or the possible new mistress for the concert, at.