ˈæftɚ bˈaɪəɡɹˌæf swˈɪtʃt tə θˈɜːɾi fˈaɪv ˌɛmˈɛm fˈɪlm pɹədˈʌkʃən ɪn nˈaɪntiːnhˈʌndɹɪd tˈuː, ænd ðə nˈʌmbɚɹ ʌv fɹˈeɪmz pɜː sˈɛkənd wʌz hˈævd, kˈæslɚɹ ˈɔːlsoʊ hˈɛlpt dʒˈɑːn pɹˈɔs tə dɪvˈɛləp ɐ θɹˈiːblˈeɪd pɹədʒˈɛktɚ ʃˈʌɾɚ ðæt ɡɹˈeɪtli ɹᵻdˈuːst flˈɪkɚɹ ɪnðə pɹədʒˈɛktᵻd ˈɪmɪdʒ.
After Biograph switched to 35 mm film production in 1902, and the number of frames per second was halved, Casler also helped John Pross to develop a three-blade projector shutter that greatly reduced flicker in the projected image.