. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 54 FUMIGATION INVESTIGATIONS IN CALIFORNIA. SO as to fit the opening in the drum. The one difficuky with this device is that the flow of acid is uneven and spouting. To offset this, Mr. Wilham Wood, of Whittier, Cal., has contrived a small copper tube for attachment to the pipe, one end of the tube being ex- posed to the open air, the other end extending up above the level of the acid within the drum, thus allowing an uninterrupted flow of air into the latter. This apparatus is illustrated in figure 16. A third m
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 54 FUMIGATION INVESTIGATIONS IN CALIFORNIA. SO as to fit the opening in the drum. The one difficuky with this device is that the flow of acid is uneven and spouting. To offset this, Mr. Wilham Wood, of Whittier, Cal., has contrived a small copper tube for attachment to the pipe, one end of the tube being ex- posed to the open air, the other end extending up above the level of the acid within the drum, thus allowing an uninterrupted flow of air into the latter. This apparatus is illustrated in figure 16. A third method in use is to transfer the drums from the wagon to a platform 2 or 3 feet high. The acid may then be removed very easily by means of a piece of rubber hose employed as a siphon (fig. 17).. Fig. 16.—An improved pipe for removing acid from drums. (Original.). 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 United States. Bureau of Entomology. Washington : G. P. O.
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