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A dropper for immersion oil, which will be found to be an asset in a busy laboratory, can be made easily and inexpensively from an ordinary rubber ear and ulcer syringe and a bit of glass tubing. The glass tubing, which should be just large enough to pass through the orifice of the syringe, should be bent as shown in the accompanying drawing, and should be long enough to reach almost to the bottom of the bulb. The bent delivery end is to be drawn out so that its lumen is large enough to admit only a fine platinum needle.
This oil dropper puts accurate delivery of the oil and the size of the drop under the control of the user. It does not spill its contents when tipped over, nor does its exterior become covered with sticky oil drippings. It requires only one hand to operate. It delivers uniformly
Gilman LL. A CONVENIENT OIL DROPPER. JAMA. 1917;LXVIII(16):1177. doi:10.1001/jama.1917.04270040165008
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