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Death light for insects
816
CURRENT TOPICS.
[J. F. I.
chloride. The refrigeration unit constitutes a compact group comprising a compressor, condenser and evaporator. R. H.'O. Death Light for Insects. (Business Week, Oct. 5, I935.)--Prof. W. B. HERMS and his assistant, J. K. ELLSWORTHof the University of California, experimenting in their laboratory with the effect of colored light on insects, found that each type of pest has a "favorite color." Continued experiments indicated the color preferences of each kind of flying insect and the exact intensity which attracts it most effectively. The grape leafhopper for instance, nightmare of California's vineyardists, prefers pale blue. So does the artichoke plume moth. A device was worked out putting the discoveries to actual use in the fields. It consists of a wire cage 8 in. in diameter, the alternate wires being connected to the terminals of a transformer which supplies enough voltage to electrocute the insects. A luminescent tube is used as a lure and is suspended along the axis of the cage so that the insect will come in contact with the wires as it flies toward the light. R. H. O. Cotton-Fabric Reinforced Roads. W . K . BECKHAM AND W. H. MILLS. (Engineering News Record, Vol. 115 No. I4.)--For the purpose of developing additional use for the product that occupies so important a place in the agricultural and manufacturing activities of the state, the South Carolina highway department in 1926 began studies on cotton fabric as a reinforcement for bituminous surface treatment. To date this practice and use has reached a stage of high development. Eight practical experiments were made on roads using several kinds of fabric. Conclusions recommend for future work a fabric with warp ends from 12 to 17 per inch and fill ends from 12 to I7 per inch, weighing about 4.25 oz. per sq. yd. Based on results obtained on experiments conducted prior to 1935, it appears that cotton fabric used as a reinforcement in bituminous surface treatment reduces cracking, raveling and failures. When the fabric is properly embedded in bituminous material, it is well preserved. In one instance, fabric which has been down for nine years is still in good condition. The experimental sections constructed this year should give very valuable additional information, as a number of different methods of construction have been included. R. H. O. Telemetering Aids Operation of District Steam Distribution System.--T. E. PURCELL describes in Heating, Piping and Air
CURRENT TOPICS.
[J. F. I.
chloride. The refrigeration unit constitutes a compact group comprising a compressor, condenser and evaporator. R. H.'O. Death Light for Insects. (Business Week, Oct. 5, I935.)--Prof. W. B. HERMS and his assistant, J. K. ELLSWORTHof the University of California, experimenting in their laboratory with the effect of colored light on insects, found that each type of pest has a "favorite color." Continued experiments indicated the color preferences of each kind of flying insect and the exact intensity which attracts it most effectively. The grape leafhopper for instance, nightmare of California's vineyardists, prefers pale blue. So does the artichoke plume moth. A device was worked out putting the discoveries to actual use in the fields. It consists of a wire cage 8 in. in diameter, the alternate wires being connected to the terminals of a transformer which supplies enough voltage to electrocute the insects. A luminescent tube is used as a lure and is suspended along the axis of the cage so that the insect will come in contact with the wires as it flies toward the light. R. H. O. Cotton-Fabric Reinforced Roads. W . K . BECKHAM AND W. H. MILLS. (Engineering News Record, Vol. 115 No. I4.)--For the purpose of developing additional use for the product that occupies so important a place in the agricultural and manufacturing activities of the state, the South Carolina highway department in 1926 began studies on cotton fabric as a reinforcement for bituminous surface treatment. To date this practice and use has reached a stage of high development. Eight practical experiments were made on roads using several kinds of fabric. Conclusions recommend for future work a fabric with warp ends from 12 to 17 per inch and fill ends from 12 to I7 per inch, weighing about 4.25 oz. per sq. yd. Based on results obtained on experiments conducted prior to 1935, it appears that cotton fabric used as a reinforcement in bituminous surface treatment reduces cracking, raveling and failures. When the fabric is properly embedded in bituminous material, it is well preserved. In one instance, fabric which has been down for nine years is still in good condition. The experimental sections constructed this year should give very valuable additional information, as a number of different methods of construction have been included. R. H. O. Telemetering Aids Operation of District Steam Distribution System.--T. E. PURCELL describes in Heating, Piping and Air