. The Clear Lake gnat. Diptera; Diptera. 18 University of California—Experiment Station The necessity of refilling the pots and lighting them daily as well as the unpleasantness of the smoke and dead insects soon eliminated this method. Suction-Fan Traps.—During the summer of 1927 several existing types of light traps were tested, all of which attracted gnats, but none of which disposed of the insects effectively. The electrocuting devices. SACK M *j)(feiiii(f. mr. Fig. 8.—Diagrammatic drawing of combined light and suction-fan trap showing arrangement of prin- cipal parts. tested soon became c
. The Clear Lake gnat. Diptera; Diptera. 18 University of California—Experiment Station The necessity of refilling the pots and lighting them daily as well as the unpleasantness of the smoke and dead insects soon eliminated this method. Suction-Fan Traps.—During the summer of 1927 several existing types of light traps were tested, all of which attracted gnats, but none of which disposed of the insects effectively. The electrocuting devices. SACK M *j)(feiiii(f. mr. Fig. 8.—Diagrammatic drawing of combined light and suction-fan trap showing arrangement of prin- cipal parts. tested soon became clogged; also the gnats caught fire and generally after brief operation the traps became ineffective until cleaned. The idea of combining an electric light and a suction fan to obviate clogging was then conceived and a trap was devised by Burgess which gave en- couraging results. This trap (fig. 8) was first described elsewhere. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Herms, William B. (William Brodbeck), 1876-1949. Berkeley, Cal. : Agricultural Experiment Station
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