wˌaɪl tˈiːtʃɪŋ, hiː fˈaʊnd ðæt stˈuːdənts wɜː hˌævɪŋ tɹˈʌbəl jˈuːzɪŋ ðə mˈoːɹ kˈɑːmplɛks plˈɑːɾɚz kˈɑːmən æt ðə tˈaɪm, ænd dᵻsˈaɪdᵻd tə mˌeɪk hɪz ˈoʊn.
While teaching, he found that students were having trouble using the more complex plotters common at the time, and decided to make his own.