Apparatus:
retort,
mounting
bracket,
pair
of
identical
pendulums,
spring
Description:
In
the
case
of
the
large
or
the
small,
the
pendulums
are
suspended
from
a
retort
with
the
bracket
and
are
joined
with
a
spring.
Setting
one
into
oscillation
induces
oscillation
in
the
other.
PIRA 3A70.25