Letters from Mrs. Elizabeth Holt promising contributions towards new Physics Laboratories, 1898, 1903 (B. 4/1/33); George Holt Physical Laboratory: letters from the architects, memorial re: naming of the laboratory, and description of it, 1899-[1905] (B. 6A/11); Draft contract with the builders of the George Holt Physical Laboratory [ca. 1902] and letter from Mrs. Elizabeth Holt to Professor Wilberforce re: naming of the laboratory, 1903, as well as summary of accounts (C. 1060); 2 photographs of Oliver J. Lodge, George Holt, and Benjamin Davies, with 'Ether Machine,' n. d. [ca. 1891-1892] (C. 5308/1); letter from Oliver J. Lodge to Miss Holt referring to photographs of her father [and Lodge] with the 'Ether Machine' which he sends to her as a representation of the interest her father took in the experiments, 1899 (B. 1/1/25).