Democratic Sentinel, Volume 18, Number 34, Rensselaer, Jasper County, 7 September 1894 — The Bolometer. [ARTICLE]

The Bolometer.

It is stated that Prof. Langley of the Smithsonian Institution has perfected an instrument called a bolometer, in which a current of electricity is passed through a very fine wire. The Resistance of the wire and consequently the strength of the current passing through it varies with the temperature, and by noting changes of current variations of temperature of the wire amounting to .000001 degree Centigrade (.00000047F.) are detected. With this instrument some hitherto unknown facts - regarding the spectroscope have been discovered.—[Detroit Free Press.