PNEUMATIC TROUGH
\njuːmˈatɪk tɹˈɒf], \njuːmˈatɪk tɹˈɒf], \n_j_uː_m_ˈa_t_ɪ_k t_ɹ_ˈɒ_f]\
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A trough, generally made of wood or jaanned tin, having a perforated shelf, used, when filled with water or mercury, for colecting gass made by chemical operations.
By Stormonth, James, Phelp, P. H.
