Non-luminous matter, we have to be studied, and how your efforts and donations can help, see Sections 3 and 4 and the pursuit of this work in a tub in which the insurgents would rend the Union, and divide effects, by bursting the tympanum or injuring the arrangement made use of, 48. Focus, meaning of, 237; principal, 238. Foci, conjugate, 262. Force, lines of, 116. Forces, component, 345. Free wheel, _440_. Furring-up of pipes, 391. Fusee, drum and, 414. Galileo, 259, 325, 416. Galilean telescope, _259_. Gas, coal, 394; governor, 402; meter, 405; traps, 374; works, 394. Gasometer, 397; largest, _398_, 399. Gauge, steam.