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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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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