text_original: If too thick a thread is used, the swelling (the rising caused in the back by the thread) will be too much, and it will be impossible to make a proper rounding or get a right size "groove" in backing.
text_transcription: IF TOO THICK A THREAD IS USED THE SWELLING THE RISING CAUSED BY THE BACK OF THE THREAD WILL BE TOO MUCH AND IT WILL BE IMPOSSIBLE TO MAKE A PROPER ROUNDING OR GET A RIGHT SIZED GROOVE IN THE BACKING
phonemes: ɪf tˈuː θˈɪk ɐ θɹˈɛd ɪz jˈuːzd, ðə swˈɛlɪŋ (ðə ɹˈaɪzɪŋ kˈɔːzd ɪnðə bˈæk baɪ ðə θɹˈɛd) wɪl biː tˈuː mʌtʃ, ænd ɪt wɪl biː ɪmpˈɑːsᵻbəl tə mˌeɪk ɐ pɹˈɑːpɚ ɹˈaʊndɪŋ ɔːɹ ɡɛt ɐ ɹˈaɪt sˈaɪz "ɡɹˈuːv" ɪn bˈækɪŋ.