This series contains drawings relating to lightstations in the South Australia/Northern Territory region. Within the series are drawings of buildings, cylinder arrangements, lanterns, optical apparatus, platforms, sites, towers and unattended lights. 

The drawings which vary in size are all pen and ink and are controlled by a two number (the primary number indicates the type of drawing and the secondary number is the drawing number) with 'SN' [South Australia/Northern Territory] prefix.