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.
Power Plant. The heart of the steamboat is the steam engine. Many different designs and variations of steam engines were developed and tried during the era of steam ships. The basic Watt engine was the most important design.To start the process, water is fed to a boiler that heats it up until it produces steam.The steam is then fed into a piston cylinder. It pushes the piston up to the top of its stroke. When it reaches the top, a valve is opened in the side of the cylinder to vent out the steam.o start the process, water is fed to a boiler that heats it up until it produces steam. The steam is then fed into a piston cylinder. It pushes the piston up to the top of its stroke. When it reaches the top, a valve is opened in the side of the cylinder to vent out the steam.