Elements of natural philosophy (Volume 2-3) . 128 NATURAL PHILOSOPHY. Frictionapparatus; Nodal pointsfound; MusicalInstruments. Vibrationsproduced in barsby c 0, is a steel spring connectingthem, and d, d, are two rings in-tended to receive the fingers withwhich the friction is the padding with spiritof wine, and sprinkle on it a littlefinely pulverised metal or wooden bars areused, the readiest mode will be for the operator to put on a leather glove, on the thumband index finger of which is some pounded resin, andwTith these to rub the rods. The exis
Elements of natural philosophy (Volume 2-3) . 128 NATURAL PHILOSOPHY. Frictionapparatus; Nodal pointsfound; MusicalInstruments. Vibrationsproduced in barsby c 0, is a steel spring connectingthem, and d, d, are two rings in-tended to receive the fingers withwhich the friction is the padding with spiritof wine, and sprinkle on it a littlefinely pulverised metal or wooden bars areused, the readiest mode will be for the operator to put on a leather glove, on the thumband index finger of which is some pounded resin, andwTith these to rub the rods. The existence of nodal points may be verified by slidingsmall paper rings loosely on the rod. These vibratory movements have been applied to musi-cal purposes in some instruments. Kallmanns Ilarmo-nichord and Ciiladnis JSupAon act on this principle. § 119. Beside the two species of vibration described al-ready, elastic rods admit of a third, viz., that by is most easily generated in cylindrical bodies, by secur-ing one end in a vice, and communicating to the other arotatory motion by means of a bow or by friction. Analternate expansion and contraction ensu
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