1851, Frederick Overman, “Blast Pipes”, in The Manufacture of Iron, in All its Various Branches. […], 2nd edition, Philadelphia: Henry C. Baird, page 413:
Various forms of conductors have been invented, such as wooden and iron pipes, of a round, square, and polygonal section; but at present, scarcely any other than sheet or cast iron pipes are employed.
1979 May, Ernest Gueymard, “Louisiana's Creole-Acadian Cuisine”, in Renaud S. Albert, editor, A Franco-American Overview, volume 1, →ISBN, page 295:
The old black cast iron skillet is an important part of the batterie de cuisine.
2008, Steven P. Moysey, The Road to Balcombe Street: The IRA Reign of Terror in London, Binghamton, N.Y.:Haworth Press, →ISBN, page 58:
Three small gelignite bombs, with pocket watch timing devices, were concealed in packets small enough to fit through the slot of the standard cast-iron post box, the cylindrical bright red colored boxes so common throughout London.
Ernest has a cast iron constitution and never gets sick.
1932 January, Charles W. Purcell, “Stop Telling the Pilot What to Do”, in Popular Aviation, volume 10, number 1, →ISSN, page 62:
Just because a pilot passes a pretty severe medical test every so often, it doesn't mean that he has a Cast Iron constitution and can fly indefinitely.