Images Dated 25th July 2013

SEM diamond stylus travelling through LP grooves H100/0086

Scanning electron micrograph of a diamond stylus travelling through the grooves of a long-playing, stereo record. The grooves are cut into a flat disc of polyvinyl chloride. The groove varies with the intensity of the music: 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. Although thoroughly cleaned, this needle is encrusted with dirt. Magnification: x30 at 35mm size, x220 at 8x10-inch size. Reference: MICROCOSMOS, figure 9.16, page 182

© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

The Girlhood of Mary, right wing of the Weston Triptych, c.1480 (oil on panel)

490552 The Girlhood of Mary, right wing of the Weston Triptych, c.1480 (oil on panel) by Weyden, Rogier van der (1399-1464) (school of); 128x43 cm; Museum of the Order of St. John, London, UK; (add.info.: See also 490549-51.); A© Museum of the Order of St. John ; Netherlandish, out of copyright

© © Museum of the Order of St. John / Bridgeman Images

A MK-38 25mm machine gun is fired aboard USS William P. Lawrence

July 25, 2013 - Gunnera??s Mate observes as a MK-38 25mm machine gun is fired during a live-fire exercise aboard the guided-missile destroyer USS William P. Lawrence

© Stocktrek Images

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