-
Zaccharias Janssen and son Hans Janssen observed that viewed objects in front of the tube were getting enlarged creating the compound microscope
-
Jansen invented the first basic microscope, with him people would have never know about cells.
-
-
Learns to grind lenses and assemble them into simple microscopes by Antoni Van Leeuwenhoek
-
Robert Hooke used a microscope to have sketches in his book called Micrographia
-
Heinrich expanded the electromagnetic theory of light.
-
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
-
Matthias Jakob Schleiden looked at numerous plant samples and found that all plants are composed of cells.
-
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.
-
N. Pringsheim observed how a sperm cell penetrated an egg cell
-
Rudolf Virchow extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells.
-
Richard Zsigmondy invented the ultramicroscope that could study objects under the wavelength of light.
-
Leo conceived the electron microscope, linear accelerator, and cyclotron.