This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Swan Electric Light Co. incandescent light carbon double arch filament c. DSC. Light bulb exhibited in the Franklin Institute Philadelphia Pennsylvania USA took this photograph Daderot Light bulbs in the Franklin Institute
Page 2023 Free-images.com. All images are Public Domain