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Keywords:
LIGHTHOUSES,
ELECTRIC,
ELECTRICITY,
LIGHTS,
DISTRIBUTION,
ILLUMINATION,
GENERATION,
GENERATORS,
MACHINES,
MACHINERY,
DYNAMOS,
COSTS,
OPTICAL,
APPARATUS,
POWER,
FOG,
EFFICIENCY,
OIL,
VISIBILITY,
DIOPTRIC,
PRISMS,
GAS,
SEA,
SAFETY,
NAVIGATION,
LENSES,
REFRACTORS,
PHOTOMETRY,
AIDS
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© Thomas Telford and ICE
1879
