Montague Island Lighthouse Heritage Management Plan 2020
Equipment when builtEquipment when built
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Equipment when built
Following construction, Montague lighthouse stood as a 21 m tall circular granite tower with a light source powered by kerosene, providing an intensity of 45,000 cd.
The 910 mm focal radius, 8 panels, 1st Order Chance Bros. lantern and lens rotated on a roller pedestal which operated by clockwork mechanism and weights in the central tube within the tower.
The lens revolved every four minutes with:
“a steady flare for 30 seconds, then an eclipse for 13 seconds, and then a brilliant flash lasting four seconds, followed by another eclipse of 13 seconds’ duration.” 13
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Figure 19. View of Montague Island Lighthouse, 1917 (NAA, 4746689)