MNH has a free leaflet about the Calf of Man, it's
history ,how to reach it etc. It contains a map & photo
of the remains of the 1818 lower lighthouse which is
little altered by time although the interior was stripped
out including , I understand , very special wooden panelling.
W Lockington Marshall wrote a 96p book about all
aspects of the Calf including the lighthouses in 1978.
Shearwater Press ISBN904980 19 7