The top bead on the upper deck was equal to five and the bottom one is similar to the Chinese or Korean abacus, and the decimal number can be expressed, so the abacus is designed as a one:four device.
ðə tˈɑːp bˈiːd ɔnðɪ ˌʌpɚ dˈɛk wʌz ˈiːkwəl tə fˈaɪv ænd ðə bˈɑːɾəm wˈʌn ɪz sˈɪmɪlɚ tə ðə tʃaɪnˈiːz ɔːɹ kɚɹˈiːən ˈæbækəs, ænd ðə dˈɛsɪməl nˈʌmbɚ kæn biː ɛkspɹˈɛst, sˌoʊ ðɪ ˈæbækəs ɪz dɪzˈaɪnd æz ɐ wˌʌn:fˈoːɹ dɪvˈaɪs.