Three-quarter spring

The Dennett spring (three-quarter spring) was invented in England about 1825. It is a type of platform spring (like the mail or telegraph spring), but has only one cross spring. It is also called three-quarter spring.

Tonneau

Tonneau (fr.: "barrel") is the four wheel version of a governess cart: A small vehicle of rounded shape with two longitudinal seats; entry is gained  through an outward opening door and low step iron in the rear. It was considered safe for young children in the care of a governess.

Three-quarter Coupé

An enlarged version of the brougham, having a semicircular or extended front glass and two seats inside for the accomodation of four passengers.

Telegraph spring

A combination of springs applied to a carriage, designed to bring the body as near as possible to the axle. It consists of four half elliptic springs forming a quadrangle, arranged in parallel pairs. Their use is confined to heavy vehicles.

Tent Wagon

Wagon with textile hood, fixed on a frame.

Thoroughbrace

When the berlin  first appeared in the second half of the 17th century it had a new system of suspension: long leather straps, called thoroughbraces, passed under the body, and where attached to and regulated by the windlasses or jacks at the axles. They where made of a number of leather straps stitched togehter and served the combined purposes of spring and body loop.

Tentwagen (Dutch)

Wagon with textile hood, fixed on a frame.