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Discovery Miles 3 710
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Loot Price R371
Discovery Miles 3 710
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This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1904 edition. Excerpt: ...is blown out, the excited
activity remains behind on the surface, but rapidly loses its
activity in the course of a few hours. After several hours, the
intensity of the residual radiation is very small. These effects
and their connection with the emanation are discussed more fully in
chapter IX. Giesel1 has recorded some interesting observations of
the eftect of the radium emanation on a screen of phosphorescent
zinc sulphide. 1 Ber. dtr deuttch. Chem. Ges. p. 3608, 1902. a.
r.-A. 14 When a few centigrams of moist radium bromide were placed
on a screen, any slight motion of the air caused the luminosity to
move to and fro on the screen. The direction of phosphorescence
could be altered at will, by a slow current of air. The effect was
still further increased by placing the active material in a tube
and blowing the air through it towards the screen. A screen of
barium platino-cyanide or of Balmain's paint failed to give any
visible light under the same conditions. The luminosity was not
altered by a magnetic field, but it was affected by an electric
field. If the screen were charged the luminosity was more marked
when it was negative than when it was positive. Giesel states that
the luminosity was not equally distributed, but was concentrated in
a peculiar ring-shaped manner over the surface of the screen. The
concentration of luminosity on the negative, rather than on the
positive, electrode is probably due to the excited activity, caused
by the emanation, and not to the emanation itself. This excited
activity (see chap. IX) in an electric field is concentrated
chiefly on the negative electrode. The electric field, probably,
does not act on the emanation itself but concentrates the excited
activity, due to the emanation present, on to the...
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