1 teaspoon vanilla extract. 1 large egg. Lightly grease a doughnut (or muffin) tin and preheat the oven to 350F. Sift the flour, cocoa powder, baking powder and baking soda, and then whisk in the sugar, nutmeg and salt.
steam engine. An engine in which the energy of hot steam is converted into mechanical power, especially an engine in which the force of expanding steam is used to drive one or more pistons. The source of the steam is typically external to the part of the machine that converts the steam energy into mechanical energy.
George Stephenson was the first inventor of the steam engine locomotive. He used the improvements of the steam engine itself, invented by James Watt, to make a better way of t â¦ ransportation.The purpose of this locomotive was make an easier way to transport and trade goods across the United States.he Greek inventor Hero invented a steam turbine, the aeliopile, sometime around 40 or 50 AD. Thomas Newcomen (1664-1729) was the English inventor (1712) of a practical piston steam engine, initially used to pump water from mines.