27.0 MB (27.0 MB compressed)
3753 x 2516 pixels
31.8 x 21.3 cm ⏐ 12.5 x 8.4 in (300dpi)
DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of the grooves of a long-playing (stereo) record, showing particles of dust on the surface. The grooves are cut into a flat disc of polyvinyl chloride. The straightness of the groove varies with the intensity of the music recorded: the straighter the groove the quieter the music, the wavier the groove the louder the music. The stylus travels through the groove picking up the music modulation from the sloping sides. It is transmitted to the cartridge where a piezoelectric crystal or an electromagnet converts vibration into an electrical signal. Magnification: X 30 at 35mm size, X 200 at 8x10-inch size.
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