Publisher's Synopsis
Excerpt from Photographic Optics: A Text Book for the Professional and Amateur
To take a practical and familiar example, we place in the fire-box of the boiler attached to the engine of a steam crane a certain quantity of coal. This coal contains a vast amount of energy in the potential or latent form, not making itself apparent to any of our senses, but requiring only that certain conditions will be fulfilled when the potential energy will be changed with various other forms. The conditions are the presence of oxygen with which the carbon and hydrogen of the coal may combine, and, generally, some internal stimulus to start the combination. In plain language, the fire of coals wants air. And requires to be lighted.
We now immediately have energy exhibited in two forms - light and heat. A certain amount of light will probably escape by the furnace door, and possibly by the chimney.
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