'By 1880 both Edison & British physicist Joseph Wilson Swan had applied for patents on this type of electric lamp'
an incandescent light bulb
19th CENTURY SCIENCE: By 1880 both Edison & British physicist Joseph Wilson Swan had applied for patents on this type of electric lamp
By 1880 both Edison & British physicist Joseph Wilson Swan had applied for patents on this type of electric lamp
By 1880 both Edison & British physicist Joseph Wilson Swan had applied for patents on this type of electric lamp
19th CENTURY SCIENCE
an incandescent light bulb
19th CENTURY SCIENCE