kˈæslɚ hˈɛlpt dɪvˈɛləp ɐ pˈoːɹɾəbəl hˈændkɹˈæŋkt kˈæmɹə ɪn nˈaɪntiːnhˈʌndɹɪd tə ɹᵻplˈeɪs ðə bˈʌlki, mˈoʊɾɚɹˈɑːpɚɹˌeɪɾᵻd kˈæmɹə jˈuːzd ʌntˈɪl ðˈɛn.
Casler helped develop a portable hand-cranked camera in 1900 to replace the bulky, motor-operated camera used until then.