The general visual effect of a diorama is similar to that which the observer gets when looking in or out of a window onto the actual scene.

A diorama, or a series of dioramas, is used principally as the focal point of an exhibit, such as a world's fair exhibit, traveling display, window or industrial museum.

The M;irrhan(l Dinramn Cotji , Mt Vrrnon. N. Y.

Diorama of the Columbia Steel Company, Subsidiary of the U. S. Steel Company, Under Construction in the Marchand Studio.

This diorama was part of an exhibit at the Golden Gate Exposition in San Francisco.

DIORAMAS

DIORAMA IN PLACE

PLATE (3iLA$S

LINE OF DIRECT IMAGE TUNNEL

U S. Dfpnrlmcnt of Acricultiirc. Bureau of Public Ro;ul».

A. Sketch Illustrating the Reflecting Device for the Historical Dissolving Diorama Exhibit Illustrating 400 Years of Highway Development in America from 1539 to 1939.

Eacli of the dioramas is six I'nchcs in dcptli. To secure tlie apjiearance of a third dimension in tliis sniall space, the lin'ires were molded on the face of a curved piece of tin.

Uniird Sl.ntct Stcrl Cori>oration. N< w Y.dk City.

B. Chart in the Entrance of the United States Steel Subsidiaries' Exhibit at the New York World's Fair. 1939.

1. This chart shows tlie growth in the use of steel per capita in the United States from

the time of George Washington. In 1789, the use per capita was one-half pound. In 19J9. the use per capita is 19,000 pounds or 9', j tons.

2. The indispensability of steel in modern times is the theme of the huge mural seen in