Most lighthouse towers are wooden, concrete, cast iron or granite. Shapes are square,
pyramidal, octagonal, conical, cylindrical, skeletal or flying-buttress.
Colour schemes are combinations of red, black and white in various configurations
which may include, horizontal, vertical, or spiral bands and checkerboard pattern.
First lights were acetylene gas. Major lighthouses use high wattage incandescent bulbs.
Today many are solar powered.
The fog horn at a few stations was sounded by explosions.
The stack protruding vertically is where charges of powder were set off.
Diaphone Fog Signals
where next in use. They were replaced by
Electronic Fog Signal devices. Many stations have an automatic
Fog Detector.
At some an emergency light operates during power outages.
A few have Radar Beacons.
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Upper left is main light lamp located in the lantern room below.
Bottom left is the fresnel lens.
Center is a typical lighthouse.
Right top is a fog detector which controls the fog signal below.
Beneath that is the emergency light.
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