15—7.
EARTH AS A MAGNETÏC 'SPECTROGRAPH
349
-
-
@
_AMPLÏFIÈR
CIRCUIT
.
,
METER
\
,
;'
_
_
_
.
Frs. 15—8. A double coihcidenCe Counter.
,
thepenetrating radiation must pass through all three tubes at
essentially the same instant before a count is observed.
If radiations approach along the line joining the tubes, as
indicated by the dotted lines of gure
a large number of
coincidence count: will be recorded, whereas, if the radiations
,
approach at right angles therewill be very few counts. Thus,. by
mounting the tubes rigidly together and pointing them in different
‘
directions, it is possible to tell the line along which the penetrating
_
‘
.
rays are travelling.
_
_
_
With such a telescope, it was found that the radiation which
_
produces coincidence counts, in the absence of all” local sources, is
much
in‘ the vertical direction and that it decreases —rapidly in strength until, it is negligible‘
at approximately _n—inety
.
degrees.
—
‘Î '
‘
._
f
’
Experiments with coincidence;countenslpindicate,
are operated by charged=and
Expan—
sion chambers
lead) ”are
=
placed at various pos…onsaboveanbetweenthecwnter tub‘êS'
_
15_7.
The
,
.
Consist of mvghgdptlthy
-
that
Ï1t93î
_
Interls1tydoes€>
dens1tywhlchactsasa1te”transm1tthem@feeneretlcandt°
'
.
:‘_1.stopthelessenergetmPamde3FurtherseœndaWralw°ns*
=
:
EARTH AS A MAGNETÏC 'SPECTROGRAPH
349
-
-
@
_AMPLÏFIÈR
CIRCUIT
.
,
METER
\
,
;'
_
_
_
.
Frs. 15—8. A double coihcidenCe Counter.
,
thepenetrating radiation must pass through all three tubes at
essentially the same instant before a count is observed.
If radiations approach along the line joining the tubes, as
indicated by the dotted lines of gure
a large number of
coincidence count: will be recorded, whereas, if the radiations
,
approach at right angles therewill be very few counts. Thus,. by
mounting the tubes rigidly together and pointing them in different
‘
directions, it is possible to tell the line along which the penetrating
_
‘
.
rays are travelling.
_
_
_
With such a telescope, it was found that the radiation which
_
produces coincidence counts, in the absence of all” local sources, is
much
in‘ the vertical direction and that it decreases —rapidly in strength until, it is negligible‘
at approximately _n—inety
.
degrees.
—
‘Î '
‘
._
f
’
Experiments with coincidence;countenslpindicate,
are operated by charged=and
Expan—
sion chambers
lead) ”are
=
placed at various pos…onsaboveanbetweenthecwnter tub‘êS'
_
15_7.
The
,
.
Consist of mvghgdptlthy
-
that
Ï1t93î
_
Interls1tydoes€>
dens1tywhlchactsasa1te”transm1tthem@feeneretlcandt°
'
.
:‘_1.stopthelessenergetmPamde3FurtherseœndaWralw°ns*
=
: