Historical Marker
Courthouse Square Historic District
Historical marker location:
101 North Hart Street, Princeton, Indiana
( Marker is on North Hart Street just north of West Broadway Street (Indiana Route 65), on the left when traveling north.)
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.