see also Communications (Telegraph, Telephone)
  see also Lighting (Gas, Electric)
  see also Organisations - Scientific Societies
  see also Photography and Optical

    — futurology 
     — Greenwich Observatory
    — hair-brushing machinery 
    — Knight's American 
            Mechanical Dictionary 
    — Mesmerism
    — phonograph
    — phrenology
    — reprography
    — sound recording (humour)
    — vivisection 
    — X-rays