ClipArt ETC
The evolute spiral central junction is a wave pattern that mimics the wave of the sea.

Evolute Spiral Central Junction

The evolute spiral central junction is a wave pattern that mimics the wave of the sea.

Junction between an arch and the column, pier, or wall on which it rests.

Impost, Continuous

Junction between an arch and the column, pier, or wall on which it rests.

Junction between an arch and the column, pier, or wall on which it rests.

Impost, Discontinuous

Junction between an arch and the column, pier, or wall on which it rests.

Junction between an arch and the column, pier, or wall on which it rests.

Impost, Shafted

Junction between an arch and the column, pier, or wall on which it rests.

Fastening designed to unite abutting ends of rail.

Rail Joint

Fastening designed to unite abutting ends of rail.