An illustration of Carpenter's Hall in Philadelphia, where the First Continental Congress assembled.
An anthracite coal mine. Anthracite is a variety of mineral coal known by its high luster.
A compound riveted girder is designed to bear a large load in a building or bridge, and is made of either…
Karnak is a vast grouping of ruined temples, chapels, pylons and other buildings located mear Luxor,…
This illustration shows a light inverted bow-string girder, as well as a section.
A riveted steel plate girder is designed to bear a large load in a building or bridge, and is made of…
Outlines of buildings (house, lighthouse) made from tangram pieces. Tangrams, invented by the Chinese,…
Solutions for outlines of buildings (house, lighthouse) made from tangram pieces. Tangrams, invented…
Silhouette outlines of buildings (house, lighthouse) made from tangram pieces. Tangrams, invented by…
Solutions for silhouette outlines of buildings (house, lighthouse) made from tangram pieces. Tangrams,…
The White Tower, the square building with turrets on each corner that gave it its name, is actually…
A drawing of the academic buildings of West Point, the United Stated Military Academy.