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 book of 1655 inventions mentions a steam engine (called a fire engine) pump used to raise a column of water 40 feet [12 m], but there was no mention of whether it was portable. Colonial laws in America required each house to have a bucket of water on the front stoop during fires at night.