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In addition to the Christmas Lectures at the Royal Institution, two other courses are regularly offered, the Afternoon Lectures and the Friday Evening Discourses. The latter, which are justly famous, are given at 9 o'clock each Friday evening from November until June. At that time a discourse "is delivered by some recognized authority, either upon some novel discovery, some recent development of scientific speculation, or some fresh aspect of a social, literary, artistic or scientific problem. These lectures are illustrated, so far as the subject permits, by experiments, diagrams and lantern slides. Interesting and sometimes unique exhibits, illustrative of some subject of current discussion, are arranged in the library, which is at the disposal of Members and their guests for social and conversational purposes both before and after the lectures."

american journal of physics

Reproductions of Prints, Drawings and Paintings of Interest in the History of Physics 14B. Paintings of Lectures at the Royal Institution: A Friday Evening Discourse on Liquid Hydrogen by Sir James Dewar, 1904