DUBOACQ'S COLORIMETER
\djˈuːbə͡ʊkz kˈʌləɹˌa͡ɪmiːtə], \djˈuːbəʊkz kˈʌləɹˌaɪmiːtə], \d_j_ˈuː_b_əʊ_k_z k_ˈʌ_l_ə_ɹ_ˌaɪ_m_iː_t_ə]\
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An apparatus for measuring the depth of tint in a fluid by comparing it with a standard fluid; glass cylinders are immersed in each of two cups containing, one the standard fluid, the other the fluid to be tested; on looking through the cylinders the tints are equalized by raising or lowering the cylinder in one cup, and the extent of this raising or lowering registers the exact difference in tint.
By Stedman, Thomas Lathrop
