carbon-points

The best arrangement is the invention of Edison, and is controlled most ingeniously by the current itself, acting through the increased difficulty of its passage when the two carbon-points are too far apart, and the increased ease with which it flows when they are too near together.

Steam, Steel and Electricity James W. Steele

There are two principal systems of electric lighting; one is by actually burning away the ends of carbon-points in the open air.

Steam, Steel and Electricity James W. Steele

The current, in leaping the small gap between the carbon-points, takes a _curved_ path, hence the name "arc" light.

Steam, Steel and Electricity James W. Steele

To assure himself still further, he substituted a reflected image of one of the white-hot carbon-points for the sunbeam, with an identical result.

A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874

The magnified image of the carbon-points is now upon the screen; and with a suitable instrument the heating power of the rays which form that image might be readily demonstrated.

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856

Still, refractory as carbon is, if we closely examined our voltaic arc, or stream of light between the carbon-points, we should find there incandescent carbon-vapour.

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856

But instead of gathering up the rays from the carbon-points by a condensing lens, we gather them up by a concave mirror (_m_ _m'_, fig. 48), silvered in front and placed behind the carbons (P).

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856

Causing the beam which builds the image of our carbon-points to pass through the spar, the single image is instantly divided into two.

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856

But the waves from our incandescent carbon-points appeal to another sense than that of vision.

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856

Employing the image of an aperture instead of that of the carbon-points, we have two coloured circles.

Six Lectures on Light Delivered In The United States In 1872-1873 John Tyndall 1856