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6 RAYS OF POSITIVE ELECTRICITY

are the origin of streams of greenish luminosity, the colour of
the path of the cathode rays through helium. The difference
In the character of the rays is also made evident by bringing
a small magnet near the discharge tube; the green rays are
visibly deflected by the magnet but no appreciable effect is
produced on the red rays. By using polygons instead of
triangleSj or scalene triangles Instead of equilateral ones, very
interesting distributions of the red and green pencils can be

#v V , y^^r%

A- • -ti..^

^t<4:s, \:i-: J*-

FIG. 3.

obtained. Researches on these parallel cathodes have been
made by Kunz¹ and Orange,² and they are often useful for
giving strong pencils of positive rays in definite directions;
we shall have to consider later on examples of their use for
this purpose.

¹ Kunz, « Phil. Mag,," VI, xvi, p. 161,1908.

^s Orange, " Proc. Camb. Phil. Soc.," XV, p. 217.



	6 *RAYS* OF POSITIVE ELECTRICITY are the origin of streams of greenish luminosity, the colour of the path of the cathode rays through helium. The difference In the character of the rays is also made evident by bringing a small magnet near the discharge tube; the green rays are visibly deflected by the magnet but no appreciable effect is produced on the red rays. By using polygons instead of triangleSj or scalene triangles Instead of equilateral ones, very interesting distributions of the red and green pencils can be

	#v V , y^^r% A- • -ti..^ ^t<4:s, \:i-: J*-



	FIG. 3. obtained. Researches on these parallel cathodes have been made by Kunz¹ and Orange,² and they are often useful for giving strong pencils of positive rays in definite directions; we shall have to consider later on examples of their use for this purpose. ¹ Kunz, « Phil. Mag,," VI, xvi, p. 161,1908. ^s Orange, " Proc. Camb. Phil. Soc.," XV, p. 217.