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.
Steam Engines. The first steam-powered engine was invented in 1698 by Thomas Savery, although this machine was not intended for powering rail vehicles. Whilst the engine could be used for its intended purpose (raising water), there were several serious flaws in the design.