Chinworth Bridge

Historical marker location:

Warsaw, Indiana

( Marker can be reached from the intersection of Old U.S. 30 and Road 350 N, on the left when traveling west.)

Marker installed: 1999

The first public demonstration of the electric light bulb was given by Thomas Edison in Menlo Park, New Jersey, but the first practical incandescent light bulb was invented by Lewis Howard Latimer, who was born in Chelsea, Massachusetts, but lived in Indiana for a time. Latimer was also the first African American to be employed as an engineer by the U.S. Patent Office.