| Description | Written from 4 Stonefield Terrace, Liverpool Road. The letter explains that Riddle has taken out a patent for a method of using a gas flame rather than a steam jacket to keep steam engine cylinders hot and asks if Brunel thinks it is worth Riddle going beyond the provisional stage of the letters patent. There is an annotation across the upper left corner of the reverse directing the shape of the reply, which is that Brunel cannot offer an opinion on Riddle's idea but that whether an idea is good and if it is worth pursuing a patent on it are two completely different things. |