File of biographical details and cuttings, and a draft of parts of a book entitled The Mystery Man of the Welsh Mountains. n.d.

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Various documents relating to H. Grindell MatthewsD/D Z 346

News cuttings relating to the invention of a radio controlled airship, the setting up of the Grindell Matthews Wireless Telephone Syndicate Ltd., the invention of talking pictures, and the death ray. April 1910-August 1925D/D Z 346/1

Album of photographs of Grindell Matthews and his dog, and his death ray machine, the machine in operation and a motorbike which was stopped by the ray. n.d., 1920sD/D Z 346/2

News cuttings relating to the invention and marketing of the death ray. May 1924-June 1924D/D Z 346/3

News cuttings relating to the invention of talking pictures, the wireless telephone, and the death ray. May 1920-May 1924D/D Z 346/4

News cuttings relating to the inventions of a radio controlled airship or torpedo, the wireless telephone, talking pictures, and the death ray. April 1909-July 1924D/D Z 346/5

News cuttings relating to the invention of the wireless telephone, talking pictures, and the death ray. 1921-July 1924D/D Z 346/6

News cuttings relating to the invention of the death ray, his marriage to Mrs Olive Waite, and making music by the use of light rays. May 1924-March 1926D/D Z 346/7

News cuttings relating to the invention of the death ray. 1924D/D Z 346/8

File of news cuttings and biographical notes relating to Grindell Matthews, including copies of patents of his improved optical projection machine, the radio telephone, the aircraft turn and bank indicator, and musical sound, with news cuttings relating to rocket powered travel. 1920s-1980sD/D Z 346/9

File of notes relating to Grindell Matthews, including notes on his second wife, Madam Ganna Walska, and correspondence between Mr A. H. L. Barwell and various libraries and institutions about Grindell Matthews. 1941-1987D/D Z 346/10

File of notes and press cuttings relating to Grindell Matthews, and to Ernest Barwells biography of him, entitled The Death Ray Man. 1939-1984D/D Z 346/11

File of notes on Grindell Matthews, including manuscript of The first broadcast concert, about the use of wireless to broadcast voice and music, The secret life of John Logie Baird, and a chapter from the book Spycatcher. n.d.D/D Z 346/12

File of notes, letters and cuttings relating to the life and work of Grindell Matthews. 1917-1937D/D Z 346/13

File of biographical details and cuttings, and a draft of parts of a book entitled The Mystery Man of the Welsh Mountains. n.d.D/D Z 346/14

File of notes and a manuscript entitled Sir Bernard Docker and the Kronenberg Scandal by Arthur Henderson, about the theft of a large sum of money from a bank. n.d.D/D Z 346/15

Manuscript for a book entitled The visitors to the mountains, relating to Grindell Matthews work at his Mynydd-y-gwair laboratory prior to the Second World War. n.d.D/D Z 346/16

Manuscript for a book entitled Horizons are made to cross - the memoirs of E. H. G. Barwell, journalist and broadcaster, who was a friend of Grindell Matthews; includes covering letters about the publication of the manuscript. n.d. and 1994D/D Z 346/17

File of photographs of Grindell Matthews, his model ship Dawn which he used to demonstrate the principle of radio control of ships, and the making of a talking film. n.d., 1930sD/D Z 346/18