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 Vocabulary. 1  Internal combustion engine: An engine, like a car engine, that burns fuel inside it. 2  Locomotive: type of train engine. 3  Coal: a soft, black rock made from fossilized plants that burns easily.  Blocks or cylinders which are pushed down by the steam in a steam engine.