BATTERY HYDROMETER.
\bˈatəɹi ha͡ɪdɹˈɒmɪtə], \bˈatəɹi haɪdɹˈɒmɪtə], \b_ˈa_t_ə_ɹ_i h_aɪ_d_ɹ_ˈɒ_m_ɪ_t_ə]\
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A hydrometer which has its scale graduated so that the zero point indicates the density of pure water and the 10 point of the scale indicates the density of a 10 per cent, salt solution. Upon this basis the point 666 of the scale indicates the density of 100 per cent, sulphuric acid.
By Smith Ely Jelliffe
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dust storm
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