Sesmograph or Seismograph: How To spell?

The word Sesmograph is misspelled against Seismograph, meaning "An instrument for recording the phenomena of earthquakes."

Word contains consecutive vowels 'EI' in between alphabets s & smograph is misspelled as 'E' as letter 'I' is phonetically igno
Wrong Spelling:  s-e-smograph 
Correct Spelling:  s-ei-smograph 
Find more incorrect spellings of Seismograph to spell right way.