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. They worked slowly, making only about fifteen strokes a minute, and they were expensive also, a single engine burning fifteen thou  sand dollars' worth of coal in a year.
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 THEY WORKED SLOWLY MAKING ONLY ABOUT FIFTEEN STROKES A MINUTE AND THEY WERE EXPENSIVE ALSO A SINGLE ENGINE BURNING FIFTEEN THOUSAND DOLLARS WORTH OF COAL IN A YEAR
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. ðeɪ wˈɜːkt slˈoʊli, mˌeɪkɪŋ ˈoʊnli ɐbˌaʊt fˈɪftiːn stɹˈoʊks ɐ mˈɪnɪt, ænd ðeɪ wɜːɹ ɛkspˈɛnsɪv ˈɔːlsoʊ, ɐ sˈɪŋɡəl ˈɛndʒɪn bˈɜːnɪŋ fˈɪftiːn ðˈaʊ sˈænd dˈɑːlɚz wˈɜːθ ʌv kˈoʊl ɪn ɐ jˈɪɹ.