English: Concrete street signs in Pittsburgh in 1916. From the Engineering News, July 6, 1916: The use of concrete as material for constructing streetname signs is novel at the present time, but it has proved practicable. Two such signs are shown in Fig. 9. These were designed and installed recently by the Department of Public Works of Pittsburgh. Both post and signboard are of granite-finished concrete. The design shown at the left is modified as a Lincoln Highway marker. The signplates are separate from the post, being so constructed that they swing about a vertical axis and may be clamped at any desired angle. The letters, of a black cement composition of permanent color, are about ⅜ in. thick and dovetailed securely into the concrete of the background.