text_original: Berg  man employed an iron crucible. This effectually prevented the addition of any earthy matter. But at a red heat the iron crucible itself is apt to be corroded by the action of the alkali, and thus the mineral under analysis becomes contaminated with a quantity of that metal.
text_transcription: BERGMANN EMPLOYED AN IRON CRUCIBLE THIS EFFECTUALLY PREVENTED THE ADDITION OF ANY EARTHY MATTER BUT AT A RED HEAT THE IRON CRUCIBLE ITSELF IS APT TO BE CORRODED BY THE ACTION OF THE ALKALI AND THUS THE MINERAL UNDER ANALYSIS BECOMES CONTAMINATED WITH A QUANTITY OF THAT METAL
phonemes: bˈɜːɡ mˈæn ɛmplˈɔɪd ɐn ˈaɪɚn kɹˈuːsᵻbəl. ðɪs ɪfˈɛktʃuːəli pɹɪvˈɛntᵻd ðɪ ɐdˈɪʃən ʌv ˌɛni ˈɜːθi mˈæɾɚ. bˌʌt æɾɚ ɹˈɛd hˈiːt ðɪ ˈaɪɚn kɹˈuːsᵻbəl ɪtsˈɛlf ɪz ˈæpt təbi kɚɹˈoʊdᵻd baɪ ðɪ ˈækʃən ʌvðɪ ˈælkəlˌaɪ, ænd ðˈʌs ðə mˈɪnɚɹəl ˌʌndɚɹ ɐnˈæləsˌɪs bɪkˌʌmz kəntˈæmᵻnˌeɪɾᵻd wɪð ɐ kwˈɔntᵻɾi ʌv ðæt mˈɛɾəl.