Wednesday, 21 July 2010

Rotating Movements of the Filming Mechanism in Plan

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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