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f^A FS OF POSITIVE ELECTRICITY

to /, the EDF a right angle, and DE small

with the depth of the pole pieces of the electro-

Place the col! so that DF is along the direction in

\vhich the particle Is projected. D being at the point of pro-

and F at the distance at which the deflection is measured,
connect up the coil with a ballistic galvanometer, or what is

FIG. 4.

more convenient with a Grassot flux meter, and determine the

number of lines of magnetic force which pass through this coil

the electromagnet is made or broken ; from this number

we can easily determine the value of A. For if N is this

number, then we see from Fig. 4 that

N = f H x PN . dx

the figure

hence

N = f H .55(/ -

Thus when N is known A can be at once determined.



10	f^A FS OF POSITIVE* ELECTRICITY*

to /, the EDF a right angle, and DE small with the depth of the pole pieces of the electro- Place the col! so that DF is along the direction in \vhich the particle Is projected. D being at the point of pro- and F at the distance at which the deflection is measured, connect up the coil with a ballistic galvanometer, or what is

E. P

FIG. 4. more convenient with a Grassot flux meter, and determine the number of lines of magnetic force which pass through this coil the electromagnet is made or broken ; from this number we can easily determine the value of A. For if N is this number, then we see from Fig. 4 that N = f H x PN . dx Jo the figure

DE			FD

hence		N = f H .55(/ -

Thus when N is known A can be at once determined.