Image
|
Source
|
Observations
from the source
|
|
Gallenkamp
(1930s)
|
Bar
and gauge to show expansion on heating
|
|
Gallenkamp
(1930s)
|
Ball
and ring to show increase in diameter on heating
|
|
Gallenkamp
(1930s)
|
Ball
and ring to show increase in diameter on heating
|
|
Gallenkamp
(1930s)
|
Ball
and ring to show increase in diameter on heating
|