METHOD OF OBSERVING
59
the slit there Is practically no deflection ; as soon, however, as the
magnetic force is such that a parabola comes on the slit, there
Is a considerable deflection which disappears when the magnetic
force Is increased so as to drive the parabola past the slit The
appearance and disappearance of the deflection of the electro-
scope are surprisingly sharp, so that lines quite near each other
can be detected and separated. An example of the results
obtained by this method Is given in Fig. 35. The abscissas
magnetic force is such that a parabola comes on the slit, there
Is a considerable deflection which disappears when the magnetic
force Is increased so as to drive the parabola past the slit The
appearance and disappearance of the deflection of the electro-
scope are surprisingly sharp, so that lines quite near each other
can be detected and separated. An example of the results
obtained by this method Is given in Fig. 35. The abscissas
n
-L-A.
LJ^
** I a 1 -y
"* Carbon.Monoxide^ 320 Volts»
FIG. 35.
are the values of the magnetic force used to deflect the rays,
and the ordinates the deflection of the Wilson electroscope in
i o seconds. The gas in the tube was carbon monoxide.
and the ordinates the deflection of the Wilson electroscope in
i o seconds. The gas in the tube was carbon monoxide.
A comparison of this curve -with a photograph of the dis-
charge through the same gas shows many Interesting features.
On the photograph the strongest lines are those corresponding
to the atom and molecules of hydrogen. The curve on the
other hand shows that the number of hydrogen particles is
charge through the same gas shows many Interesting features.
On the photograph the strongest lines are those corresponding
to the atom and molecules of hydrogen. The curve on the
other hand shows that the number of hydrogen particles is