OPEN-AIR ORCHARD HEATING IN COLORADO. BY W. FRANK IVOLITRIC. Spraying the trees with apparatus which also conveys oil t the pots. One of the many different styles of pots used in smudging. An oil pot with hood in place. Another type of pot in which oil is used. Raising the temperature in a Colorado orchard. A photograph taken late in the evening showing coal pots with draft covers set. Typical Colorado orchards ; young trees in the distance. OPEN-AIR ORCHARD HEATING IN COLORADO., scientific american, -1909-10-09
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