Word: collodion
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Dates: during 1960-1969
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...laboratory and the microscope's chief operator, explains that he protects bacteria by enclosing them in a tiny air-filled cell that fits on the microscope's stage. The cell has two windows, one on the top, the other on the bottom, which are covered with collodion film less than four-millionths of an inch thick. The windows are so small (four-thousandths of an inch in diameter) that this gossamer stuff has enough strength to resist the suck of the vacuum. So the cell keeps its moist air and the bacteria...