. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO 15 Concrete bins are the most common. However, in some silos steel bins are installed. In the early days of the fumigation program some difficulty was encountered with gas leakage through the porous cement walls. This has been corrected by the use of internal bituminous coatings, covered by two layers of rubber-based paint. The general layout of the fumigation system is illustrated in Figure 9. The fumigant dis- pensing machinery is always installed in the floor below the bins. By means of a system of
. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO 15 Concrete bins are the most common. However, in some silos steel bins are installed. In the early days of the fumigation program some difficulty was encountered with gas leakage through the porous cement walls. This has been corrected by the use of internal bituminous coatings, covered by two layers of rubber-based paint. The general layout of the fumigation system is illustrated in Figure 9. The fumigant dis- pensing machinery is always installed in the floor below the bins. By means of a system of piping the fumigant (Figs. 12 & 13) may be carried to any desiied bin in the silo and exhausted therefrom at the end of the exposure period. By manipulation of the appropriate valves, re- circulation of the fumigant may be carried out as desired. The usual dosage of methyl bromide applied is 15 grams per cubic meter. The flow of the fumigant from the gas cylinder is regulated by a flowmeter, which in turn is controlled by a concentration meter set up in the piping. This concentration meter works on the principle of the thermal conductivity of COa; hence the need for this gas to the extent of 10% of the fumigant mixture. The fumigant flows into the expansion chamber (Fig. 10) and is then in-. Figurc 10. Swiss silos, steel expansion chamber, with blower and attachment for methyl bromide cylinder. (Photo courtesy H. M. Government, ). 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 Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
