Ffeil BOX 12/1. - File of provisional specifications, mainly of inventions or designs re telegraphy patented by Sir Oliver Lodge and Messrs Muirhead & ...,

File of provisional specifications, mainly of inventions or designs re telegraphy patented by Sir Oliver Lodge and Messrs Muirhead & Co., Electrical Engineers, and by Ben Davies and the same company, and including Marconi's provisional specification for 'Improvements in Transmitting Electrical Impulses and Signals ...', 1896. There is also a patent granted to Ben Davies in 1893 for 'Improvements in electric measuring instruments'.