Skip to main content
sales@mediastorehouse.com
Framed Pictures, Canvas Prints
Posters & Jigsaws since 2004
Home > All Images > 1990 > May > 24 May 1990

Images Dated 24th May 1990

Choose from 11 pictures in our Images Dated 24th May 1990 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


False-colour SEM of the crown wheel of a watch Featured 24 May 1990 Print

False-colour SEM of the crown wheel of a watch

False-colour scanning electron micrograph of the crown wheel of a Swiss-made, 17-jewel INCABLOC watch. The crown wheel is part of the watch's winding mechanism. When the watch is wound, the winding pinion (small gear wheel seen edge-on at bottom) rotates, meshing with the crown wheel. The rotation of the crown wheel causes the ratchet wheel at top left to turn, & this wheel is attached to the barrel which holds the mainspring of the watch. The mechanism is clean; the tiny dust particles would not affect its function. The absence of screwdriver marks in the crown wheel's slot shows that the assembly has never been serviced. Magnification: x4 at 6x4.5cm size

© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY