The National Geographic Magazine, Volumes 98-99National Geographic Society, 1951 - Geography Indexes kept up to date with supplements. |
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Page 697
... light , room - cool to the touch ( page 701 , right ) . Light Virtually Without Heat In the average electric bulb only about 3 percent of the electrical energy goes into vis- ible light ; most of the rest is lost in heat . In the firefly's ...
... light , room - cool to the touch ( page 701 , right ) . Light Virtually Without Heat In the average electric bulb only about 3 percent of the electrical energy goes into vis- ible light ; most of the rest is lost in heat . In the firefly's ...
Page 697
... light . This woman plucks the insects , like glowing flowers of the night , at Uji , famed for its fireflies . Professional catchers sometimes pop them into their mouths for temporary safekeeping . Japanese buy thousands of the insects ...
... light . This woman plucks the insects , like glowing flowers of the night , at Uji , famed for its fireflies . Professional catchers sometimes pop them into their mouths for temporary safekeeping . Japanese buy thousands of the insects ...
Page 697
... light , that of P. pyralis , was found by Dr. William W. Coblentz , of the National Bureau of Standards , to have a usual strength of one 400th candlepower . bright , but often sustained for minutes at a time , is that of the big " fire ...
... light , that of P. pyralis , was found by Dr. William W. Coblentz , of the National Bureau of Standards , to have a usual strength of one 400th candlepower . bright , but often sustained for minutes at a time , is that of the big " fire ...
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