A clock ticking every
n milliseconds, in real time.
Since
n is in the type signature, it is ensured that when
composing two signals on a
Millisecond clock, they will be
driven at the same rate.
For example,
Millisecond 100 ticks every 0.1 seconds,
so 10 times per seconds.
The tag of this clock is 'Maybe Double', where
Nothing
represents successful realtime, and
Just lag a lag (in
seconds).