Letter from O J L [Oliver Joseph Lodge], Normanton House, Lake, near Salisbury, to [Joseph] Larmor He is ashamed to say that he is reading [Paul] Langevin's 1913 paper for the first time, which introduced him to Poincaré pressure. This fits into Lodge's scheme. It accounts for the Fitzgerald contraction and additional energy over and above the electrostatic field. He does not see it giving a polar contraction without equatorial expansion. It does suggest that an electron is a hollow vacuous cavity, in equilibrium. This may be too simple, and may not fit Larmor's scheme in 'Aether and Matter'. 26 May 1924