_
”
2—4,
THE WIECHERT METHOD
27
As this condition is; approached the two spots become closer and
closer together until nally only one spot is observed. Then
_
|
v = — = 2 L
2—10
T /2
f )
(
‘
)
where f, the frequency of the oscillator, may be measured in terms
of its wave-length >\ (=c/f, c = SX 1010) by means of Lecher
.
C)
'
m
,
8
.
L—
.g.
“
5
5
Time 5 —>
C
|
|
'
'.,°3.
‘
:
:
l
'
o
“
:
:
'
:
°—
'
:
.
:
:
…
o
_
'
|
:
\
_
:
,
’
:
4
:
,
.
l
.
|
l
|
‘_
'
,
:,
:
.
:
:
…
:
.
_
|
(
»
|
U
-
:
:
.
: »
’
..
.
g;
:
,
:
:
_
”g
-
:
:
5
.
/
8
:
2
:
.
_
,
.
s
….y
……
.
_93
:
_
-
,
FIG. 2—5.
forces.
_
wires.
Thus,_ a direct measurement of the velocity of »the'elœ“ti-ons may be made and “used
equation
.
’
‘_
_
toglve
:*
-
_
‘
2f2L2
‘
"
'
-
6772
emu 1‘
2—11
/108/7
/g
()
IndusflsmcyclesperseœndLlsmcenümetersandVlsm
heusedmagneücmsteadfeleCtrlcde€Ctlngf0fœsandacoïd
dlschafgetubemsœad°fah0tïmentæaS@urœ©feleCtrons Ï Ÿ
…
lllüll