. Animal flight; a record of observation . Fig. 82. Plan of after part of a ship showing soarable area (as dotted line)on leeward side of stern. The arrow shows the wind direction. is the nature of the wind. In Agra some winds aresoarable and other winds are not soarable. Apparentlyin both cases some unknown factor affecting soarabilityis involved. 10th February. At —Several gulls had stayed behind andsettled on the sea, probably to eat some refuse. They started flappingafter the ship. Each one as it reached the soarable area on the leewardside and near the sea level, turned through a
. Animal flight; a record of observation . Fig. 82. Plan of after part of a ship showing soarable area (as dotted line)on leeward side of stern. The arrow shows the wind direction. is the nature of the wind. In Agra some winds aresoarable and other winds are not soarable. Apparentlyin both cases some unknown factor affecting soarabilityis involved. 10th February. At —Several gulls had stayed behind andsettled on the sea, probably to eat some refuse. They started flappingafter the ship. Each one as it reached the soarable area on the leewardside and near the sea level, turned through a right angle and glidedupwards, without flapping and at high speed, to reach the usual positionover the stern of the ship. The gain of height must have been about6 metres. The angle at which they glided upwards must have been about400 with the horizon. The gulls did not arrive all at once, but at intervalsof a few seconds, proving that the conditions favourable for upwardgliding were, at the time, permanent. When the gulls reached the po
Size: 2736px × 914px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectan, booksubjectflight
