Consists of material related to inventions patented by Trotter, as an individual and also in collaboration with other engineers, including W T Goolden and William Henry Preece, possibbly collected by Francis William Hewitt as part of the compilation of Trotter's memoirs. Documents include patent specifications; letters patent; correspondence with the Patent Office; correspondence with Abel and Imray, patent agents; draft provisional specifications; illustrations and drawings; publications related to Trotter's inventions. The inventions mentioned in the material include the curve-ranger, improvements in the method and apparatus for distributing and diffusing powerful lights, improvements in photometers, and the electric meter.
