Round iron or steel rods, as used in the early days of re-inforced concrete, are now superseded by specially shaped bars, designed to utilise the strength of the metal to the fullest extent and to minimise the quantities of steel and concrete required to secure the necessary factor of safety.
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https://paperspast.natlib.govt.nz/periodicals/P19160501.2.3.3
Bibliographic details
Progress, Volume XI, Issue 9, 1 May 1916, Page 605
Word Count
50Page 605 Advertisement 3 Progress, Volume XI, Issue 9, 1 May 1916, Page 605
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