Trace Gallery

Lead ion collision C014/1793

Particle tracks from a lead ion collision seen by the CMS (compact muon solenoid) detector at CERN (the European particle physics laboratory) near Geneva, Switzerland. Before the collision the ions had been accelerated by the large hadron collider (LHC). The central tracking chamber (cylindrical) and muon chambers (red rectangles) of the detector are seen end-on in outline. The collision produced a number of unidentified particles (orange) and an upsilon meson. The upsilon meson is not seen, but is revealed through its decay products; a pair of muons (two longest red lines). The green lines show the energy deposited by the muons in the detector's muon chambers. The energies of the unidentified particles are measured by the electrochemical calorimeter (shorter red lines) and the hadron calorimeter (blue)

© CMS EXPERIMENT, CERN/SCIENCE PHOTO LIBRARY

The Delights of the Captive Balloon, a Reply to a Recent Suggestion (engraving)

1040465 The Delights of the Captive Balloon, a Reply to a Recent Suggestion (engraving) by Ralston, William (1848-1911) (after); Private Collection; (add.info.: The Delights of the Captive Balloon, a Reply to a Recent Suggestion. Illustration for The Graphic, July 1901.); Look and Learn / Illustrated Papers Collection; English, out of copyright

© Look and Learn / Illustrated Papers Collection / Bridgeman Images

Silhouette device

A safe and convenient machine to draw silhouettes, design by E Lorsay after Lavater. The subject sits on a seat, illuminated by a candle flame; the artist can then trace the shadow of their profile on to a piece of paper. Date: 1807

© Mary Evans Picture Library

1807, 1810s, Art, Artist, Candle, Copying, Design, Device, Draw, Drawing, Historical, History, Illuminated, Lavater, Lorsay, Machine, Profile, Shadow, Shadows, Silhouette, Silhouettes, Sitting, Trace, Tracing, Woman