To do this, Moseley measured the wavelengths of the innermost photon transitions (K and L lines) produced by the elements from aluminium (Z = 13) to gold (Z = 79) used as a series of movable anodic targets inside an x-ray tube.
tə dˈuː ðˈɪs, mˈoʊsli mˈɛʒɚd ðə wˈeɪvlɛŋθs ʌvðɪ ˈɪnɚmˌoʊst fˈoʊtɑːn tɹænsˈɪʃənz kˈeɪ ænd ˈɛl lˈaɪnz pɹədˈuːst baɪ ðɪ ˈɛlɪmənts fɹʌm ˌæljʊmˈɪniəm zˈiː ˈiːkwəlz θˈɜːtiːn tə ɡˈoʊld zˈiː ˈiːkwəlz sˈɛvənti nˈaɪn jˈuːzd æz ɐ sˈɪɹiz ʌv mˈuːvəbəl ænˈɑːdɪk tˈɑːɹɡɪts ɪnsˈaɪd ɐn ˈɛksɹˈeɪ tˈuːb.