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He had a table in the middle of the room where he sat to look at his specimens through a magnifying glass or simple microscope, and to read his scientific papers.

To investigate the nature of chromosomes, Henking examined cells under a simple microscope.

"One is to give it to researchers, so everyone who has a simple microscope can utilise it to do great science - including high school kids," Prof Gangopadhyay said.

In one of his letters he speaks on this point, and remarks that he suspects the work of a man who never uses the simple microscope.

There are several devices for mounting these simple microscopes on stands so that they can be kept steady and the objects to be examined placed behind them.