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A device has just been perfected for economically oiling ponds and other waterways in mosquito control and is conceived as a practical method for having oil companies deliver oil to boards of health and others.
The invention consists of a conical can, which is constructed with a diaphragm near the bottom, the lower chamber thus formed to contain weight, such as sand, and an upper chamber, which will contain oil. Both chambers are equipped with a cap for filling. A tube is soldered to the outside of and runs the length of the oil chamber, with an inlet at the top and opening into the oil chamber at the bottom. The apex of the oil chamber has a wire wick of the desired size to permit the oil to escape in droplets.
In practical use, the can is tossed into a pond; the weight sinks it; air escapes
Wetmore WO. A DEVICE FOR ECONOMICALLY OILING PONDS AND OTHER WATERWAYS. JAMA. 1926;87(16):1298. doi:10.1001/jama.1926.92680160001013