Lighthouse Register

Stepped lenses

The Fresnel lens is a stair of glass that gathers light which would otherwise scatter upward or into the ground, and throws it flat across the water.

A small flame, correctly placed, reaches astonishingly far.

First-order lens, nearly two metres tall, still in its original mounting.
First-order lens, nearly two metres tall, still in its original mounting.
Detail of the prisms near the focal plane.
Detail of the prisms near the focal plane.

More soon.

Afternoon sun caught in the upper rings.
Afternoon sun caught in the upper rings.

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