Architecture: designs for helical (spiral) staircases with twisted iron reinforcing bars. Lithograph by Dunn & Wright.

    Reference:
    44351i
    Catalogue details

    Licence: Public Domain Mark

    Credit: Architecture: designs for helical (spiral) staircases with twisted iron reinforcing bars. Lithograph by Dunn & Wright. Wellcome Collection. Source: Wellcome Collection.

    no text alternative