Which preposition to use with sphygmograph

on Occurrences 1%

It would be an interesting experiment if some professor of experimental psychology would arrange his class in the laboratory with sphygmographs on their wrists ready to record those pulse movements which accompany the sensation of 'thrill,' and would then introduce into the room without notice, and in chance order, a bishop, a well-known general, the greatest living man of letters, and a minor member of the royal family.

Which preposition to use with  sphygmograph