Girders

thumb|Ceiling of Hinkle Fieldhouse in [[Indianapolis, Indiana, is constructed of large trusses built of riveted girders]]

thumb|upright=1.35|Meccano tractor Meccano is a British brand of construction set created in 1901 by Frank Hornby in Liverpool, England. The system consists of reusable metal strips, plates, angle girders, wheels, axles and gears, and plastic parts that are connected using nuts and bolts. It enables the building of working models and mechanical devices.

type of girder