<s>
The	O
30	O
cm	O
Bubble	B-Algorithm
Chamber	I-Algorithm
,	O
prototyped	O
as	O
a	O
10	O
cm	O
Bubble	B-Algorithm
Chamber	I-Algorithm
,	O
was	O
a	O
particle	O
detector	O
used	O
to	O
study	O
high-energy	O
physics	O
at	O
CERN	O
.	O
</s>
<s>
Bubble	B-Algorithm
chambers	I-Algorithm
are	O
similar	O
to	O
cloud	O
chambers	O
,	O
both	O
in	O
application	O
and	O
in	O
basic	O
principle	O
.	O
</s>
<s>
As	O
particles	O
enter	O
the	O
chamber	O
,	O
a	O
piston	B-Device
suddenly	O
decreases	O
its	O
pressure	O
,	O
and	O
the	O
liquid	O
enters	O
into	O
a	O
superheated	O
,	O
metastable	O
phase	O
.	O
</s>
<s>
Following	O
the	O
discovery	O
of	O
strange	O
particles	O
in	O
cosmic-ray	O
showers	O
and	O
the	O
evidence	O
of	O
a	O
large	O
spectrum	O
of	O
heavy	O
mesons	B-Application
,	O
started	O
the	O
construction	O
of	O
a	O
liquid	O
hydrogen	O
bubble	B-Algorithm
chamber	I-Algorithm
.	O
</s>
<s>
A	O
prototype	O
,	O
the	O
10cm	O
Bubble	B-Algorithm
Chamber	I-Algorithm
,	O
was	O
first	O
built	O
in	O
1957	O
;	O
it	O
was	O
seen	O
as	O
a	O
learning	O
process	O
,	O
allowing	O
the	O
team	O
to	O
test	O
and	O
study	O
the	O
functionality	O
of	O
bubble	B-Algorithm
chambers	I-Algorithm
.	O
</s>
<s>
Experience	O
acquired	O
during	O
the	O
prototype	O
phase	O
enabled	O
the	O
team	O
to	O
build	O
the	O
30cm	O
bubble	B-Algorithm
chamber	I-Algorithm
.	O
</s>
<s>
The	O
chamber	O
was	O
cylindrical	O
,	O
with	O
a	O
total	O
volume	O
of	O
12.5	O
litres	O
,	O
a	O
piston	B-Device
to	O
control	O
expansion	O
,	O
and	O
a	O
coil	O
generating	O
a	O
1.5	O
T	O
magnetic	O
field	O
.	O
</s>
<s>
As	O
the	O
prototype	O
,	O
the	O
30cm	O
bubble	B-Algorithm
chamber	I-Algorithm
enabled	O
systematic	O
measurements	O
of	O
distortion	O
and	O
ionisation	O
of	O
the	O
tracks	O
,	O
studies	O
on	O
the	O
stopping	O
power	O
of	O
liquid	O
hydrogen	O
,	O
and	O
on	O
the	O
size	O
and	O
growth	O
of	O
the	O
bubbles	O
in	O
the	O
chamber	O
.	O
</s>
<s>
In	O
1959	O
,	O
it	O
was	O
placed	O
at	O
the	O
Synchro-Cyclotron	O
(	O
SC	O
)	O
where	O
it	O
was	O
first	O
exposed	O
to	O
beams	O
of	O
π+	O
mesons	B-Application
of	O
265	O
and	O
330	O
MeV	O
.	O
</s>
<s>
The	O
photographs	O
obtained	O
proved	O
the	O
exceptional	O
quality	O
of	O
the	O
30cm	O
bubble	B-Algorithm
chamber	I-Algorithm
despite	O
its	O
small	O
dimensions	O
.	O
</s>
<s>
In	O
1965	O
,	O
the	O
30cm	O
Bubble	B-Algorithm
Chamber	I-Algorithm
was	O
lent	O
to	O
the	O
National	O
Laboratory	O
at	O
Frascati	O
.	O
</s>
