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Inner Body
Innerbody: Diaphragm
This site from Innerbody.com has an illustration as well as detailed text explaining the function of the Diaphragm. See Images - Diaphragm and Descriptions - Diaphragm
Sophia Learning
Sophia: Parts of the Microscope: Lesson 2
This lesson will illustrate the different parts that make up a microscope, and explain how it works. It is 2 of 4 in the series titled "Parts of the Microscope."