Who used a compound microscope to see chambers?

Answer: Robert Hooke

Hooke was an English scientist who lived at the same time as Isaac Newton.

Hooke is credited with discovering the cells by looking through a compound microscope at a cork sheet, realizing that it was made up of small polygonal holes (like those of a honeycomb) that reminded him of the chambers in which the monks stayed (called cells), therefore he call these holes: cells.