The National Geographic Magazine, Volume 70National Geographic Society, 1937 - Geography Indexes kept up to date with supplements. |
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Page 169
... light and the smoke from an open fire . No progress was made in marine signal lights for many centuries . Only a hundred and twenty- five years ago tallow candles burned in the famous Eddystone Lighthouse near the English coast , and ...
... light and the smoke from an open fire . No progress was made in marine signal lights for many centuries . Only a hundred and twenty- five years ago tallow candles burned in the famous Eddystone Lighthouse near the English coast , and ...
Page 181
... lights during the day- time . Recently the light- sensitive cell has been employed to turn on and off automatic electric lights oper- ated from batteries . This is a metallic disk which turns light en- ergy directly into electric energy ...
... lights during the day- time . Recently the light- sensitive cell has been employed to turn on and off automatic electric lights oper- ated from batteries . This is a metallic disk which turns light en- ergy directly into electric energy ...
Page 194
... light means the port side , while a white light may be on either side . Just now a modification of this system is being introduced in this country , by which the rôle of a buoy is indicated by the char- acter of its flashing light . A ...
... light means the port side , while a white light may be on either side . Just now a modification of this system is being introduced in this country , by which the rôle of a buoy is indicated by the char- acter of its flashing light . A ...
Contents
My Flight Across Antarctica By LINCOLN ELLSWORTH__ | 1 |
Little laboratories Boston Massachusetts | 64 |
Clearwater river Idaho | 133 |
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