Aluminium bronze. Light micrograph in cross

Interference layer with colloidal silica de

Yttrium barium copper oxide, light micrograph, 1990s.

Aluminium bronze annealed. Light micrograph

Engineering polymer (POM) polyacetal with

Roman slag (thin section). Light micrograph

Coradi planimeter and map, 1886.

Planimeter, Swis, 1894.

Henry Maudslay's original screw-cutting lathe, c 1800.

Henry Maudslay's original screw-cutting lathe, c 1800.

Henry Maudslay's original screw-cutting lathe, c 1800.

Iron oxide. Light micrograph in cros polar