Circular plastic ashtray, c 1945.

Circular spring balance, 18th century.

Automatic circular knitting machine, 1923.

A copy of a photograph of a single deck combination tramcar of Manchester Corporation Tramways, operated on circular route 53, 1903,A1969.70/Box 5/Neg 1266/10

Tycho Brahe's circular equatorial, 1580.

Automatic circular knitting machine, 1923.

Circular plastic ashtray, c 1945.

'Novgorod', circular Rusian ironclad, 1875.

Rangefinding for artillery, 1745.

Comparative sizes of planets explained, 1745.

Equipment for the artillery and stacking cannonballs, 1745.

'The Blanchard Lathe', 1877.