51-60 of 57,475 results

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(a) The fasıl of the later 17th century. (b) The fasıl of the later 18th century

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(a) Three successive views of a travelling wave on a stretched string, (b) three successive views of a standing wave on a stretched string

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(a) Two waves ‘in phase’, adding to each other; (b) two waves ‘out of phase’, neutralizing each other so that no sound is heard

Charles Taylor

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(a) Undesirable foci from an orchestra created by a concave reflector behind the platform; (b) undesirable focus created on a balcony by a concave ceiling; (c) undesirable focus created in a seating plan by a concave rear wall

After R. Lewcock

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(a) Waveform of sound signal arriving at transmitter; (b) waveform of current in aerial (for the sake of clarity the spacing between cycles has been exaggerated)

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(a) Waveform produced by a treble recorder sounding c′′ (523 Hz) played rather loudly; (b) the same note bowed on a violin; (c) the same note on a clarinet; (d) waveform made by mixing a group of high-pitched tones, none below about 2000 Hz, producing an apparent c′′ in the ear as a ‘residue’ effect...

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(a) Waves alternately in and out of phase, giving rise to the ‘beat’ phenomenon; (b) waveform of two notes exactly an octave apart, giving a smooth and steady impression; (c) waveforms of notes not quite an octave apart, ‘changing step’; in each case the lowest graph is the sum of the other two...

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(a) Xylophone and (b) gourd-resonated lamellophone of the Cokwe people, Katanga region; (c) slit-drum (left), two drums with nailed heads, and basket rattles (right), Yaka people, Kwango region

Photo: Declerck, J., © Africa-Museum

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(a) Zampogna with blowpipe, two chanters and two drones, Italian (Pitt Rivers Museum, Oxford); (b) zampogna player: detail from ‘The Shepherds’, fresco from the cycle ‘Life and Glory of the Virgin’ by Ludovico Seitz, 1892–1902 (Cappella Tedesca, S Casa, Loreto

Mansell / Time Pix / Katz

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(a)–(c) Calculated curves for pure tones of the 2nd, 4th and 5th harmonics of the same fundamental; (d) sum of the three

After C. Taylor, "The Physics of Musical Sounds", 1965