text_original: He knew that that great sphere would require to be air proof. He had thought of the skins of animals; but such of these as might have been obtained in sufficient quantity, were entirely too thick and heavy to make the covering of a balloon.
text_transcription: HE KNEW THAT THAT GREAT SPHERE WOULD REQUIRE TO BE AIR PROOF HE HAD THOUGHT OF THE SKINS OF ANIMALS BUT SUCH OF THESE AS MIGHT HAVE BEEN OBTAINED IN SUFFICIENT QUANTITY WERE ENTIRELY TOO THICK AND HEAVY TO MAKE THE COVERING OF A BALLOON
phonemes: hiː nˈuː ðæt ðæt ɡɹˈeɪt sfˈɪɹ wʊd ɹᵻkwˈaɪɚ təbi ˈɛɹ pɹˈuːf. hiː hæd θˈɔːt ʌvðə skˈɪnz ʌv ˈænɪməlz; bˌʌt sˈʌtʃ ʌv ðiːz æz mˌaɪthɐv bˌɪn əbtˈeɪnd ɪn səfˈɪʃənt kwˈɔntᵻɾi, wɜːɹ ɛntˈaɪɚli tˈuː θˈɪk ænd hˈɛvi tə mˌeɪk ðə kˈʌvɚɹɪŋ əvə bəlˈuːn.