ClipArt ETC
A framed floor showing floor-joists at a, binding-joist at b, ceiling joists at c, and girder at d.

Framed Floor

A framed floor showing floor-joists at a, binding-joist at b, ceiling joists at c, and girder at d.

"Girders (in cross-section). a to l, wrought-iron girders; m to z, cast-iron girders; aa, box-girder; bb, compound I-girder; cc, coumpound beam girder; dd, I-girder." -Whitney, 1911

Girder

"Girders (in cross-section). a to l, wrought-iron girders; m to z, cast-iron girders; aa, box-girder;…

"The upright centre beam of a compound girder." — Williams, 1889

King-post

"The upright centre beam of a compound girder." — Williams, 1889