Pencil tip,coloured scanning electron micrograph (SEM). The shaved wooden surface (upper right,brown) contrasts with the tip (lower left,grey) that is used to write with. This tip is the visible end of a core of graphite and clay. This core is enclosed in wood,and both the outer wood casing and the graphite/clay core are sharpened to form the writing tip | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Nishinaga, Susumu |
Taille de l’image : | 2990 px × 3720 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |