51.1 MB (51.0 MB compressed)
5067 x 3528 pixels
42.9 x 30.0 cm ⏐ 16.9 x 11.8 in (300dpi)
DR. TONY BRAIN / SCIENCE PHOTO LIBRARY DR. TONY BRAIN / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (SEM) of the surface of a long-playing record (L.P.), showing a plan view of 10 grooves. The L.P. is made by pressing the recording information onto a softened (by heating) PVC disc. The straight groove (3rd from right) indicates an almost continuous note. The white flecks are particles of dust. The stylus sits nicely in the V-shaped groove, and lateral vibrations are picked up by the stylus and transduced by a moving-coil or moving-magnet cartridge into an electrical signal, which passes through an amplifier to be heard on loudspeakers. Magnification: X 30 at 35mm, X 220 at 8x10-inch size.
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