CatB has very kindly given permission to share the following from a scrapbook in her collection. Click to enlarge.
The 67th AA Searchlight battery were headquartered at Hurstmere Road, Takapuna, according to Peter Cooke in Defending New Zealand (2000).
The Defence Department had involvement with Rangitoto in the last century from the 1930s, but facilities there were intended not as armed defence batteries, but as guidance facilities, to assist the other batteries in aiming for the target. The "WARNING: The bearer understands the possibility of ricochet shots, and visits the island at his or her own risk" intrigues me. Were all visitors to the island put through these stringent measures?