A film of haze
lies between the balloon and the ground beneath. And the
character of this haze is continually changing, so that the
aerial observer's task is rendered additionally difficult. Its
effects are particularly notice able when one attempts to
photograph the view unfolded below. Plate after plate may be
exposed and nothing will be revealed. Yet at a slightly lower
altitude the plates may be exposed and perfectly sharp and
well-defined images will be obtained.
Seeing that the photographic eye is keener and more searching
than the human organ of sight, it is obvious that this haze
constitutes a very formidable obstacle. German military
observers, who have accompanied the Zeppelins and Parsevals on
numerous aerial journeys under varying conditions of weather,
have repeatedly drawn attention to this factor and its caprices,
and have not hesitated to venture the opinion that it would
interfere seriously with military aerial reconnaissances, and
also that it would tend to render such work extremely hazardous
at times.
When these conditions prevail the dirigible must carry out its
work upon the broad lines of the aeroplane.
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