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THE PHOTOGRAPHS 3!

both magnets are on. If there had been no loss or gain of
charge the only effect of the second field would be to remove the
spot b horizontally to another place &', and we should have only
two spots visible a and b'. We see that as a matter of fact there
are four spots a, a, b, b^f on the screen, as well as considerable
luminosity over the rectangle with these points as corners.
Let us consider these spots in succession : b' has experienced
the full horizontal as well as the full vertical deflection : it is

FIG. 22.

therefore produced by particles which have retained their
charge whilst passing through both magnetic fields. Let us
now take b: this spot has the maximum vertical deflection but
no horizontal deflection. Thus the particles producing this spot
must have been charged all the time they were in the field of
the electromagnet A, but have lost their charge before reach-
ing the field of the electromagnet B. This is an example of a
particle losing a charge on its way down the tuba Now con-
sider the spot d^m: this has not been deflected vertically at all,



	THE PHOTOGRAPHS 3! both magnets are on. If there had been no loss or gain of charge the only effect of the second field would be to remove the spot b horizontally to another place &', and we should have only two spots visible a and b'. We see that as a matter of fact there are four spots a, a, b, b^f on the screen, as well as considerable luminosity over the rectangle with these points as corners. Let us consider these spots in succession : b' has experienced the full horizontal as well as the full vertical deflection : it is



	FIG. 22. therefore produced by particles which have retained their charge whilst passing through both magnetic fields. Let us now take b: this spot has the maximum vertical deflection but no horizontal deflection. Thus the particles producing this spot must have been charged all the time they were in the field of the electromagnet A, but have lost their charge before reach- ing the field of the electromagnet B. This is an example of a particle losing a charge on its way down the tuba Now con- sider the spot d^m: this has not been deflected vertically at all,