The filming mechanism consists of two rotating elements which circle at different rates, in order to alter the camera position from the outside of the spiral in plan to a central radial position. In deciding the ratio of these two rotating elements, I shall relate it to the lighthouse I am filming within and the Needles lighthouse across the water filmed through the windows of Hurst Point Lighthouse. Each of these lighthouses have different light characteristics:
HURST POINT LIGHTHOUSE: 4 FLASHES EVERY 15 SECONDS
(LIGHT 1 SECOND, ECLIPSE 1 SECOND, LIGHT 1 SECOND, ECLIPSE 1 SECOND, LIGHT 1 SECOND, ECLIPSE 1 SECOND, LIGHT 1 SECOND, ECLIPSE 8 SECONDS)
NEEDLES LIGHTHOUSE: 2 FLASHES EVERY 20 SECONDS
(LIGHT 14 SECONDS, ECLIPSE 2 SECONDS, LIGHT 2 SECONDS, ECLIPSE 2 SECONDS)
Therefore the two pulleys shall be in the ratio of 3 : 4 derived from the ratio of their light characteristic cycles of 15 seconds : 20 seconds)
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