The Condor Volume 12-13

The Condor Volume 12-13

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...a Great Horned Owl's egg to hatch? The above are the data kept a11d anyone can make estimates on them. It seems certain that these birds did not lay an egg oftener than once in two days and that the period of incubation could not have been less than thirty days, with the probabilities on the side of a rather longer period. For our second year's work we had the experience of the first to go on, we were more confident of the owlets' ability to bear exposure, and so decided to photograph them at least once a week, let the weather offer what it would. And the offerings were of sufiicient variety! On March 16, with the young fro_m four to eight days old approximately, the temperature was well above freezing and comfortable, but we were unable to expose a plate until 4 p. m., the sun became covered with black clouds, and we were on the shady side of the tree. Ve were not hopeful, but a long exposure accomplished our purpose. In addition to the parts of three adult cottou--tails and one Bob-white which the camera shows, a fourth rabbit and a second Bob-white, also a plump field mouse, do not appear in the picture, being tucked away under the over-hanging roof to the left or buried under other remains. It was chilly on March 30 and a high wind was blowing in from the northwest. On April 13 we had a regular northwest gale to contend with and freezing temperature added. 'e varied our work with the camera by runs across the frozen timber pasture. Vhy it was that our negatives taken on these last two dates did not show motion we have never satisfactorily explained to ourselves, for only time exposures could be used. Certain it is that both the big elm and our nearly thirty-foot stretch of ladder were swaying back and forth under the lash of...
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Product details

  • Paperback | 238 pages
  • 189 x 246 x 13mm | 431g
  • United States
  • English
  • black & white illustrations
  • 1236867394
  • 9781236867391