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Of, 237; principal, 238. Foci, conjugate, 262. Force, lines of, 116. Forces, component, 345. Free wheel, _440_. Furring-up of pipes, or stops. [Illustration.

Still hotter 10 Feeble red 19 Dull red 13 Red 18 Full red. 62 Orange 89 Bright orange 144 Yellow 202 White 276 Intense white 440 Thus.