. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 442 THE EMPIRE OF THE AIR. It soars well, but only wlieu at leisure. It weighs pounds, and its surface amounts to square feet, being in the proj)ortion of square feet to the Fig. -Kestrel Falcon. Eagles.—With the fish-hawk {Pandion fltiinalis) we reach the heavy birds. We still find a bird which beats the air, but already the le- sults of inertia are manifest. When the mass is 2 pounds or more there appears a steadines
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 442 THE EMPIRE OF THE AIR. It soars well, but only wlieu at leisure. It weighs pounds, and its surface amounts to square feet, being in the proj)ortion of square feet to the Fig. -Kestrel Falcon. Eagles.—With the fish-hawk {Pandion fltiinalis) we reach the heavy birds. We still find a bird which beats the air, but already the le- sults of inertia are manifest. When the mass is 2 pounds or more there appears a steadiness in flight not found among the 1-pound Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
Size: 2605px × 960px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
