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.
Nowadays it is known as a Atmospheric Steam Engine or Newcomen Engine. 1  Water was boiled to make steam, which filled a tank called cylinder. 2  In the cylinder a piston was placed, which was pushed upward by the steam. 3  Then a spray of cold water cooled the steam so that it became liquid water again.