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Carcel
The
Carcel
is a former
French unit
for
measuring
the
intensity of light
.
The unit
was defined in
1860
as the
intensity
of a
Carcel lamp
with
standard
burner
and
chimney
dimensions
, which
burnt
colza oil
at a
rate
of
42
grams
of
colza
oil
per
hour
with a
flame
40
millimeters
in
height
.
In
modern
terminology
one carcel
equals
about 9.74
candelas
.
