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Page 246
The first use of range and direction of the sea - coast , chan- holophotal metallic mirrors above and be- nel , or harbor where the light is estab- low the annular lenses of a large revolving lished . The beams thus sent out may be ...
The first use of range and direction of the sea - coast , chan- holophotal metallic mirrors above and be- nel , or harbor where the light is estab- low the annular lenses of a large revolving lished . The beams thus sent out may be ...
Page 247
The use of color in lighthouse practice | combined with the imperfection of the has been gradually diminishing since 1837 , optical apparatus and of the burner used , and is now almost restricted to harbor renders too many ship lights ...
The use of color in lighthouse practice | combined with the imperfection of the has been gradually diminishing since 1837 , optical apparatus and of the burner used , and is now almost restricted to harbor renders too many ship lights ...
Page 312
It was followed by the Drummond lime - light , and by ignited platinum wire and various pyro- Since 1872 the use of ... The Bude and Drum- been more and more extended , and it is mond lights were tried by the Trinity now a trusted and ...
It was followed by the Drummond lime - light , and by ignited platinum wire and various pyro- Since 1872 the use of ... The Bude and Drum- been more and more extended , and it is mond lights were tried by the Trinity now a trusted and ...
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