. Mosquito control in Panama; the eradication of malaria and yellow fever in Cuba and Panama. Mosquitoes; Public health. 158 The Control of Mosquitoes These difficulties have been partially overcome by using the following drips: The simplest form of drip is a vessel with a small hole punched in the bottom. This form is still much used in places where the installation is temporary, as on temporary ditches that are wet ^7zl. Obttoa 'Bottom of on Oan on Drip made by Insertins Nail in Bottom of Container A simple form of oil drip. for relatively short periods, small pools shortly to be drained, et
. Mosquito control in Panama; the eradication of malaria and yellow fever in Cuba and Panama. Mosquitoes; Public health. 158 The Control of Mosquitoes These difficulties have been partially overcome by using the following drips: The simplest form of drip is a vessel with a small hole punched in the bottom. This form is still much used in places where the installation is temporary, as on temporary ditches that are wet ^7zl. Obttoa 'Bottom of on Oan on Drip made by Insertins Nail in Bottom of Container A simple form of oil drip. for relatively short periods, small pools shortly to be drained, etc. A five-gallon kerosene can is commonly used, having a hole punched in it by a nail. A small quantity of cotton waste is wound around the nail just below its head. The nail is then pushed through the small hole from the inside of the can. The quantity of oil allowed to drip through the opening is regulated by pushing the nail point upward or pulling the nail 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 Le Prince, Joseph Albert Augustin, 1875-; Orenstein, Alexander Jeremiah, 1879-. New York London, G. P. Putnam's sons
Size: 1701px × 1470px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorklondongpput
