John Blackett was keen to construct inexpensive and easy-to-build lighthouses in New Zealand. These designs were published as part of his paper to the Institution of Civil Engineers in London, in which Blackett demonstrated progress in lighthouse construction in New Zealand and suggested other countries might learn from these designs. Most innovative was the double wall, to be filled with rubble to a height of 8 to 10 feet (2.4 to 3 metres). This allowed cheap, easy-to-handle wood to be used while achieving the weight to ensure towers were well founded in exposed positions.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Reference: John Blackett, 'New Zealand Lighthouses.' Minutes of Proceedings of the Institution of Civil Engineers 60, part 1 (1879–80), plate 15
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