28.5 MB (2.5 MB compressed)
2809 x 3543 pixels
23.9 x 30.0 cm ⏐ 9.4 x 11.8 in (300dpi)
DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Watch cogs. Internal cogs and gears of a watch escapement. The red circles are ruby jewels used in bearings. An escapement is a device within a watch which provides periodic impulses to the balance wheel that helps to regulate time keeping. Jewels, whether natural or man-made, are used in watch bearings because their smooth surfaces offer little friction resistance and are hard-wearing. Photograph of a 17-jewel Roamer watch from Switzerland.
Model release not required. Property release not required.