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Putting multiple lenses in a tube
Zaccharias Janssen and son Hans Janssen observed that viewed objects in front of the tube were getting enlarged creating the compound microscope -
Invention of microscope
Jansen invented the first basic microscope, with him people would have never know about cells. -
Period: to
Spontaneous Generation to Cell Theory
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grinding lenses and Assembled them
Learns to grind lenses and assemble them into simple microscopes by Antoni Van Leeuwenhoek -
Observation of cork cells and made sketches
Robert Hooke used a microscope to have sketches in his book called Micrographia -
Heinrich
Heinrich expanded the electromagnetic theory of light. -
Compound Microscope
several weak lenses used together at certain distances gave good magnification and it doesn't blur the image. This was the called compound microscope. Joseph Jackson Lister -
Realization that all plants are composed of cells
Matthias Jakob Schleiden looked at numerous plant samples and found that all plants are composed of cells. -
Cell Theory was announced
Edmund Beecher Wilson said The Cell by force of habit we still continue to speak of the cell ‘theory’ but it is a theory only in name. -
Sperm Cells
N. Pringsheim observed how a sperm cell penetrated an egg cell -
All cells come from other cells
Rudolf Virchow extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells. -
ultramicroscope with wavelength
Richard Zsigmondy invented the ultramicroscope that could study objects under the wavelength of light. -
Leo Szilard
Leo conceived the electron microscope, linear accelerator, and cyclotron.