The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 113
... light on the back wall , which curved abruptly down to the toe of the cenote . At the foot of the rocky columns we came to another landing , and then the bottom dipped again , flattened , and slid into a low - arched black tunnel ...
... light on the back wall , which curved abruptly down to the toe of the cenote . At the foot of the rocky columns we came to another landing , and then the bottom dipped again , flattened , and slid into a low - arched black tunnel ...
Page 167
... light in the infrared spectrum on a lead - sulfide cell , and the cell emits voltage proportional to the amount of light . The voltage is then ampli- fied and transmitted as a signal . " ( Instruments at the various receiving sta- tions ...
... light in the infrared spectrum on a lead - sulfide cell , and the cell emits voltage proportional to the amount of light . The voltage is then ampli- fied and transmitted as a signal . " ( Instruments at the various receiving sta- tions ...
Page 674
... light intensities . But high- speed color film , which accumulates light in a way the eye cannot , reveals this astronomical gem in all its prismatic beauty . Although nebular gases appear dense , they are incredibly rarefied . This ...
... light intensities . But high- speed color film , which accumulates light in a way the eye cannot , reveals this astronomical gem in all its prismatic beauty . Although nebular gases appear dense , they are incredibly rarefied . This ...
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ACADEMY Accredited American beach beautiful birds boat boys buildings camera camp Canada Canadian Catalog cenote Chicago coast College color copter coupon Dept Dzibilchaltun eyes feet fire fish Frigidaire Funchal GEOGRAPHIC STAFF N.G.S. giant guano helicopter Indians Insurance Company Island KODACHROME BY NATIONAL KODACHROMES Kraho Lake land light living look LUIS MARDEN Mandelbaum Gate Martinique Maya miles MILITARY mountain NAME ADDRESS National Geographic Magazine NATIONAL GEOGRAPHIC PHOTOGRAPHER NATIONAL GEOGRAPHIC SOCIETY NATIONAL GEOGRAPHIC STAFF National Geographic-It identifies Nautilus North Pacific Park Pole pool port Quemoy ride River road rock ROTC sail School Scott Base sea horse Seaway ship skiers slope Sno-Cat snow South Street summer swim Tall Kayf tion Titanus told tour town Travel Agent trees trip vacation village watched West Write Yazidis York Yucatán