Standard Elizabethan weights, 1558-1582.

Three hydrometers, 1700-1730.

Articulated mannequin, Italian, 1570-1700.

Articulated iron mannequin, Italian, 1570-1700.

Electrotherapy machine, Europe, 1862.

Standards of the Realm, 1495-1601.

Japanese woman winding up a wall clock, 1700-1750.

Japanese woman winding up a wall clock, 1700-1750.

Elizabethan Exchequer standard yard, c 1582

Joule's water friction apparatus, 1843.

Half-gallon standard, 1893.

Amputation knife, Europe, 16th century.