
Tetrahedron in perspex

Tetrahedron in perspex, copied from one in use at ICI Petrochemicals Division since 1940s for the demonstration of crystallisation behaviour in four-component systems, especially o-m-p-xylenes-ethylbenzene
Tetrahedron in perspex, copied from one in use at ICI Petrochemicals Division since 1940s for the demonstration of crystallisation behaviour in four-component systems, especially o-m-p-xylenes-ethylbenzene