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 engine. New machines that were introduced during the Industrial Revolution needed more and more power to work. Up to the 18 th century England got most of its energy from waterwheels that were run by the flow of rivers. In the 1760s the Scottish engineer James Watt invented the steam engine.