This 35-page booklet published by the Quekett Microscopical Club is out of print but is now available as a free downloadable PDF on the Quekett website:
http://www.quekett.org/resources/downloads
It is quite old, but there is all sorts of interesting stuff in it.
G. W. White (1993), Setting-up the Microscope is also available as a free PDF.
Alan Wood (Quekett webmaster)
G. W. Hartley (1983), The Microscope: A Basic Guide
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