The Pratt truss is a type of structural framework commonly used in bridges and buildings. It features diagonal members that slope towards the center, which helps to efficiently distribute loads. This design is particularly effective for handling tension forces, making it a popular choice in various engineering applications. Invented by Thomas Pratt in the 19th century, the Pratt truss is known for its simplicity and strength. The vertical members of the truss carry compressive forces, while the diagonal members manage tensile forces. This combination allows for a lightweight yet sturdy structure, making it ideal for spanning long distances.