text_original: But they could not be used in deep mines, as they could lift only six or seven pounds for each square inch of the piston.
text_transcription: BUT THEY COULD NOT BE USED IN DEEP MINES AS THEY COULD LIFT ONLY SIX OR SEVEN POUNDS FOR EACH SQUARE INCH OF THE PISTON
phonemes: bˌʌt ðeɪ kʊd nˌɑːt biː jˈuːzd ɪn dˈiːp mˈaɪnz, æz ðeɪ kʊd lˈɪft ˈoʊnli sˈɪks ɔːɹ sˈɛvən pˈaʊndz fɔːɹ ˈiːtʃ skwˈɛɹ ˈɪntʃ ʌvðə pˈɪstən.