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In the laboratory it is often desirable to have at hand some sort of suction pipet for removing sediments from the bottom of centrifuge-tubes, conical glasses, etc. Those pipets which are made by fitting a rubber bulb over the end of a piece of glass tubing are usually not very satisfactory and if lost or destroyed are not quickly replaced. A medicine-dropper is always at hand or easily obtained, and would make an ideal pipet if only the glass tube were long enough to reach the bottom of the ordinary centrifuge-tube. It can, however, be easily lengthened by drawing it out in the flame to any desired length, as seen in the illustration. This will make a most serviceable pipet which is cheap and which if broken can be readily replaced.
—The ordinary medicine-dropper is rather short for making such a pipet. As long a one as possible should
Cook JE. A USEFUL PIPET. JAMA. 1913;61(10):769. doi:10.1001/jama.1913.04350100047017
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