Gallery›Wellcome Collection›Taps and dies for cutting screw threads, and a water-tight window: cross-sections, and details. Engraving by J. Cleghorn after C. Varley.
Taps and dies for cutting screw threads, and a water-tight window: cross-sections, and details. Engraving by J. Cleghorn after C. Varley.
Wellcome Collection

Taps and dies for cutting screw threads, and a water-tight window: cross-sections, and details. Engraving by J. Cleghorn after C. Varley.

Cornelius Varley

CC0 — Public Domain
Wellcome Collection

Lettering: Mr. James Jones's taps & dies. ; Mr. R. Parvin's window-sill, to keep out wet ; Drawn by C. Varley. ; Engraved by J. Cleghorn.

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