-.-. .... .. .-.. .-..
c h i l l = chill
-.-. .... .. .-.. -..
c h i l d = child
--_Hardwicke's Science-Gossip_.
* * * * *
ELECTRICITY IN TRANSITU--FROM PLENUM TO VACUUM.[1]
[Footnote 1: Presidential address before the Institute of Electrical
Engineers, London; continued from SUPPLEMENT, No. 792, page 12656.]
By Prof. WILLIAM CROOKES, F.R.S.
If an idle pole, C, C, Fig. 12 (P=0.0001 millimeter or 0.13 M),
protected all but the point by a thick coating of glass, is brought
into the center of the molecular stream in front of the negative pole,
A, and the whole of the inside and outside of the tube walls are
coated with metal, D, D, and "earthed" so as to carry away the
positive electricity as rapidly as possible, then it is seen that the
molecules leaving the negative pole and striking upon the idle pole,
C, on their journey along the tube carry a negative charge and
communicate negative electricity to the idle pole.
[Illustration: FIG. 12.--PRESSURE = 0.0001 MM. = 0.13 M.]
This tube is of interest, since it is the one in which I was first
able to perceive how, in my earlier results, I always obtained a
positive charge from an idle pole placed in the direct stream from the
negative pole. Having got so far, it was easy to devise a form of
apparatus that completely verified the theory, and at the same time
threw considerably more light upon the subject.
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