<s>
A	O
teltron	B-General_Concept
tube	I-General_Concept
(	O
named	O
for	O
Teltron	B-General_Concept
Inc.	O
,	O
which	O
is	O
now	O
owned	O
by	O
3B	O
Scientific	O
Ltd	O
.	O
)	O
is	O
a	O
type	O
of	O
cathode	B-Device
ray	I-Device
tube	I-Device
used	O
to	O
demonstrate	O
the	O
properties	O
of	O
electrons	O
.	O
</s>
<s>
There	O
were	O
several	O
different	O
types	O
made	O
by	O
Teltron	B-General_Concept
including	O
a	O
diode	O
,	O
a	O
triode	O
,	O
a	O
Maltese	O
Cross	O
tube	O
,	O
a	O
simple	O
deflection	O
tube	O
with	O
a	O
fluorescent	O
screen	O
,	O
and	O
one	O
which	O
could	O
be	O
used	O
to	O
measure	O
the	O
charge-to-mass	O
ratio	O
of	O
an	O
electron	O
.	O
</s>
<s>
The	O
'	O
teltron	B-General_Concept
 '	O
apparatus	O
consists	O
of	O
a	O
Teltron	B-General_Concept
type	O
electron	O
deflection	O
tube	O
,	O
a	O
Teltron	B-General_Concept
stand	O
,	O
EHT	O
power	O
supply	O
(	O
,	O
variable	O
)	O
.	O
</s>
