opened a bag that her husband had given to her just before his ill-fated voyage, with directions that it should not be opened until the following week. She discovered 20,000 German marks in cash (US$120,000 today) and financial statements indicating that their bank accounts were virtually empty. In a diary Diesel brought with him on the ship, for the date 29 September 1913, a cross was drawn, possibly indicating death. In 1950, Magokichi Yamaoka, the founder of Yanmar, the diesel engine manufacturer in Japan, visited West Germany and learned that there was no tomb or monument for Diesel. Yamaoka and people associated with Diesel began to make preparations to honour him. In 1957, on the occasion of the 100th anniversary of Diesel's birth and the 60th anniversary of the diesel engine development, Yamaoka donated the Rudolf Diesel Memorial Garden (Rudolf-Diesel-Gedächtnishain) in Wittelsbacher Park in Augsburg, Bavaria, where Diesel spent his childhood. Legacy After Diesel's death, his engine underwent much development and became a very important replacement for the steam piston engine in many applications. Because the diesel engine required a heavier, more robust construction than a gasoline engine, it saw limited use in aviation. However, the diesel engine became widespread in many other applications, such as stationary engines, agricultural machines and off-highway machinery in general, submarines, ships, and much later, locomotives, trucks, and in modern automobiles. Diesel engines have the benefit of running more fuel-efficiently than any other internal combustion engines suited for motor vehicles, allowing more heat to be converted to mechanical work. Diesel was interested in using coal dust or vegetable oil as fuel, and in fact, his engine was run on peanut oil. Although these fuels were not immediately popular, during 2008 rises in fuel prices, coupled with concerns about oil reserves, have led to the more widespread use of vegetable oil and biodiesel. The primary fuel used in diesel engines is the eponymous diesel fuel, derived from the refinement of crude oil. Diesel is safer to store than gasoline, because its flash point is approximately higher, and it will not explode. Use of vegetable oils as diesel engine fuel In a book titled Diesel Engines for Land and Marine Work, Diesel said that "In 1900 a small Diesel engine was exhibited by the Otto company which, on the suggestion of the French Government, was run on arachide [peanut] oil, and operated so well that very few