The Colosseum and St. Peter's at Rome are both made of this material.
The imitation travertine made with concrete, and used in the second story of the Pennsylvania Station in New York in combination with real travertine of the first story, was invented by Mr. Symmes Richardson of the firm of McKim, Meade and White of New York. He also brought the real travertine to America to have it used for the first time in a large building, the Pennsylvania Station.
Mr. Paul Deneville of New York has most successfully made a plastic travertine, composed of gypsum from Nevada combined with hemp fiber and a coloring pigment, which has been applied to all of the Exposition buildings, producing a most pleasing glareless background under the sunny skies of San Francisco.
The roofs are covered with imitation tiles, since real tiles would be too expensive for Exposition purposes.
Material of the Statues
The architectural statues - that is, those directly connected with the architecture - are of smoked-ivory tone, so that you see them as part of the architectural scheme.
Those far away from the eye, used as free statues, are, in the main, golden.
Those nearer the eye simulate bronze, the special color that seems worked out from the color of the blue eucalyptus.
All the statues of the Exposition palaces and courts are of travertine, the material of which the buildings are made.
Machinery Palace