Word: dropper
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Dates: during 1940-1949
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...Journal of Surgery, Dr. S. L. Goldberg urges chlorophyll, the green coloring matter of plants, for trench mouth. Of 122 cases with severe gum infection, 98 were cured (usually in three or four days) and 24 were improved by using chlorophyll sprays twice a day plus frequent eye-dropper injections of chlorophyll between the teeth...
Common practice has been to deposit a small amount of mercury in each tube from a mechanical "eye-dropper," which was not very precise. Insufficient mercury, Cox explained, makes the light slump quickly; too much mercury produces blotches and discoloration. Hygrade's new process seals the mercury in long sections of thin nickel tubing, feeds the tubing into a precision machine which nips off "mercury bombs" of specified length, carries the "bombs" under a magnetic device which picks out of line and discards any capsule holding even 1/1,000 gram less than the amount required...