50.4 MB (50.0 MB compressed)
5149 x 3420 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) looking down the grooves of a stereo long-playing record. The grooves are cut into a flat disc of polyvinyl chloride. The straightness of the groove will vary with the intensity of the music recorded: the straighter the groove the quieter the music, the wavier the groove (as here) the louder the music. The stylus picks up the music modulation from the sloping sides & transmits it to the cartridge, where a piezoelectric crystal or an electromagnet converts the vibration into an electrical signal. Particles of dust can be seen in & on the grooves. Magnification: X 130 at 35mm size, X 900 at 8x10- inch size.
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