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.
A steamboat uses a steam engine similar to those on a steam locomotive. An external wood or coal fire heats water in a boiler, and the pressure of its expansion into steam is â¦ used to turn a shaft that is connected to paddlewheels, or to a propeller blade.Steamboats were the first alternative to sailing vessels, and replaced them as the major form of marine vessels.onfidence votes 173K. There are three kinds of answers: ones that are mostly right, ones that are mostly wrong, and those that once were right but now are wrong. A steamboat uses an external combustion engine. A burning wood or coal fire heats the water in a boiler until the steam pressure is very high.