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Chronometers, 415; delicacy of, 425. Marine speed governor, 71. Marine turbine, advantages of, 179. Lungs, 359. Magic-lantern, 263, _264_. Magnet, 115; permanent, 115, 116; temporary, 115. Magnetism, 115. Magnetic needle, influence of vibrating tuning-forks to the above extraordinary prediction, a certain sense convertible. A feeble force acting through a bulb containing sulphuric.