1. The Patent Law Amendment Act of 1852; 15 & 16 Victoria c83.
2. The Patents, Design and Trade Marks Act of 1883; 46 & 47 Victoria c57.
3. The Patent Act of 1902; 2 Edward 7 c34.
4. The Patent Journal published annual lists for patents abandoned for 1884 to 1887 and thereafter monthly lists which have been used in this analysis.
5. S. Van Dulken, British Patents of Inventions 1617–1977: a Guide for Researchers. (The British Library, 1999), pp.31.