Building: plan, elevation, and diagrams of a circular staircase. Etching, 1850, after S. H. Brooks.
Wellcome Collection

Building: plan, elevation, and diagrams of a circular staircase. Etching, 1850, after S. H. Brooks.

1850

CC0 — Public Domain
Wellcome Collection

Lettering: The oblique or skew arch explained with the method of tracing the ribs ; S. H. Brooks art.

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