. Sanitary entomology; the entomology of disease, hygiene and sanitation. ^. Fig. 60.—Method of petrolization with oil soaked sawdust. (Ebert.) displaces the oil, the amount of displacement being regulated by oiler dropped under a bridge in a big river or placed in a largetidal bay amidst rank vegetation produces a constantly, evenly dis-tributed film of oil which is very effective. The size of the cylinder isgauged by the size of the stream. The distance to be placed apart mustdepend upon the film obtained. Lieut. Brigham (1918) of the ArmyMedical Corps used the same principle wh
. Sanitary entomology; the entomology of disease, hygiene and sanitation. ^. Fig. 60.—Method of petrolization with oil soaked sawdust. (Ebert.) displaces the oil, the amount of displacement being regulated by oiler dropped under a bridge in a big river or placed in a largetidal bay amidst rank vegetation produces a constantly, evenly dis-tributed film of oil which is very effective. The size of the cylinder isgauged by the size of the stream. The distance to be placed apart mustdepend upon the film obtained. Lieut. Brigham (1918) of the ArmyMedical Corps used the same principle when he filled a bottle with crudeoil, cut two grooves in the cork and poured oil in one groove. Whendropped in the water this automatically bubbled. To reach inaccessible 282 SANITARY ENTOMOLOGY pools he fitted a parachute to the bottle and shot it with a bow gun,using rubber bands for power. Artificial Containers of Mosquito Larva In mosquito work much attention must be given to all types ofartificial water containers, as rain barrels, cisterns, latrines, tin candumps,
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbenefic, bookyear1921
