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.
Return to Home Page. The steam engine was an external combustion engine as the fuel was burnt outside the engine. The first internal combustion engine where fuel is burnt inside the cylinder to force a piston to move was invented in 1856 by the Italians Barsanti and Matteucci.