T-iron

The current passes through a cable down the shaft to a T-iron fixed to the side of the heading.

Scientific American Supplement, No. 417, December 29, 1883 Various

T-iron slide contact pieces which are connected with the electric engine by leading wires.

Scientific American Supplement, No. 417, December 29, 1883 Various

The bilge pieces are riveted on to the bilge, and made of 9 inches by 4-1/2 inches by 9/16 inch T-iron.

Scientific American Supplement, No. 455, September 20, 1884 Various

Uprights, a a, of double T-iron, fixed to joists, k k, and connected and braced by pieces, d d, form a strong frame.

Scientific American Supplement, No. 520, December 19, 1885 Various

As shown in Fig. 263, T-iron ribs were spaced 5 ft. apart, fastened together at the top by longitudinal angle irons, and at the bottom by a sheet of steel 22 ins. wide, forming the bottom of the invert.

Concrete Construction Methods and Costs Halbert Powers Gillette

The bodies of the vertebræ are of hour-glass shape, with great lateral and interior cavities; the arches are constructed on the T-iron principle of the modern bridge-builder, the back spines are tubular, the interior is spongy, these devices being employed in great variety, and constituting a mechanical triumph of size, lightness, and strength combined.

Dinosaurs With Special Reference to the American Museum Collections William Diller Matthew 1900