Inventions and discoveries of the English include: the jet engine, the first industrial spinning machine, the first computer and the first modern computer, the World Wide Web along with HTML, the first successful human blood transfusion, the motorised vacuum cleaner, the lawn mower, the seat belt, the hovercraft, the electric motor, steam engines, and theories such as the Darwinian theory of evolution and atomic theory. Newton developed the ideas of universal gravitation, Newtonian mechanics, and calculus, and Robert Hooke his eponymously named law of elasticity. Other inventions include the iron plate railway, the thermosiphon, tarmac, the rubber band, the mousetrap, "cat's eye" road marker, joint development of the light bulb, steam locomotives, the modern seed drill and many modern techniques and technologies used in precision engineering.