At the end of July, the incandescent light bulb – patented by Thomas Edison in 1880 and a common fixture in American homes for more than a century – will pass into history. By Aug. 1, commonly used ...

IN NATURE, vol. xxv. p. 347, is a description of the spectrum of carbon as found by Professors Liveing and Dewar in a Swan lamp rendered incandescent in the ordinary way. Finding one of these lamps ...