Microscopes and microscopical objects, 1750. I: Wilson's pocket microscope. II: Scroll microscope. III: Tripod microscope - improved form of Marshall's double microscope. IV: Ascough's compound microscope. Figs 23/30: Representations of animalcules discovered by microscope in samples of ditch water and described in Royal Society Philosophical Transactions No 283. From The Universal Magazine, (London, 1750).
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