Classic ScienceFiction novel by HerbertGeorgeWells.
ISBN 0812505042 (online at http://everything2.com/?node=The+Time+Machine)
For a wiki review of the movie see TheTimeMachineMovie.
A 2002 remake was directed by Simon Wells, great grandson of HGW, and helped to prove that talent does not necessarily run in the family.
Full text available from ProjectGutenberg - http://www.gutenberg.net/etext/35
See: YouDontWantAnExceptionYouWantaTimeMachine