DRUMMOND LIGHT
\dɹˈʌmənd lˈa͡ɪt], \dɹˈʌmənd lˈaɪt], \d_ɹ_ˈʌ_m_ə_n_d l_ˈaɪ_t]\
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A very intense light produced by turning two streams of gas, one of oxygen and the other of hydrogen, in a state of ignition, upon a ball of lime. This light was proposed by Capt. Drummond to be employed in lighthouses. Another light, previously obtained by the same gentleman, was employed in geodetical surveys when it was required to observe the angles subtended between distant stations at night. The light was produced by placing a ball or dish of lime in the focus of a parabolic mirror at the station to be rendered visible, and directing upon it, through a flame arising from alcohol, a stream of oxygen gas. Called also OXYCALCIUM LIGHT, LIME-BALL LIGHT, LIME LIGHT.
By Daniel Lyons
