EXPERIMENT 8—4
185
all
a strong blue glow. Theréfrigerant should be used
in the trap (D) during this work because P4 regis€ers vapor pressures, as well as gas pressures, while P3 does not.
Without the
refrigerant, the readings of P4 Will not go below the vapor pressure
_
of mercury (about 10“3 millimeter, at room temperatures), even
though P3 registers much lower values. PlOt a curve for-the
ionization gauge which shows pressures vertically and positive ion
currents horizontally.
-
EXPERIMENT 8,—4
,
'
_
_
-A STUDY WITH PROBE$
*
Âppamz‘us.——Ïn gure 8—17, a large glass tube (B),_
70
,
centimeters long and 4 centimeters in diameter, is used as the
‘
discharge tube. The
anode (J) and cathode (C) are
rigidly supported about 30 centimeters from each other by two
‘
.,
‘ Danger—HighPoŒnhal—O-800volü
; FIM—17Probestudy°faglowdmharge
r
’
?"
glassr®dsThelead@utWesarecoedsothatYüppmgthe
tube1t1sposs1bletalocatethepr@be
185
all
a strong blue glow. Theréfrigerant should be used
in the trap (D) during this work because P4 regis€ers vapor pressures, as well as gas pressures, while P3 does not.
Without the
refrigerant, the readings of P4 Will not go below the vapor pressure
_
of mercury (about 10“3 millimeter, at room temperatures), even
though P3 registers much lower values. PlOt a curve for-the
ionization gauge which shows pressures vertically and positive ion
currents horizontally.
-
EXPERIMENT 8,—4
,
'
_
_
-A STUDY WITH PROBE$
*
Âppamz‘us.——Ïn gure 8—17, a large glass tube (B),_
70
,
centimeters long and 4 centimeters in diameter, is used as the
‘
discharge tube. The
anode (J) and cathode (C) are
rigidly supported about 30 centimeters from each other by two
‘
.,
‘ Danger—HighPoŒnhal—O-800volü
; FIM—17Probestudy°faglowdmharge
r
’
?"
glassr®dsThelead@utWesarecoedsothatYüppmgthe
tube1t1sposs1bletalocatethepr@be
atadewedpsmonm
'
-