Vidar Jernberg, Swedish chemical engineer, makes thick and plentiful fogs with a two-foot machine, of value both in warfare and in agriculture. His "smoke buoy", when dropped upon the water, starts producing 35,000 cubic metres of smoke a minute, hiding objects 30 ft. away. The "smoke projector", for land work, generates fog much faster. Several European navies are now using his methods. Their pacific value lies in spreading smoke blankets over orchards, gardens and fields to prevent the ravages of frost. Radiation from the ground is checked.
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