Excerpt from Elementary Electricity and Magnetism: A Text-Book for Colleges and Technical

The character of the science of mechanics and of the science of electro-mechanics may be further exemplified as follows: A sample of steel under test is broken by a tension of pounds, but the exact character of the action which takes place in the steel when it is placed under tension is not a matter for con sideration. Neither does one need to consider the action which takes place in the furnace of the boiler which supplies steam to the engine which drives the dynamo which supplies current to the motor which drives the testing machine! A plate of glass under test is broken down and punctured by an electromotive force of volts, but the exact character of the action which takes place in the glass when it is subjected to the electro motive force is not a matter for consideration. Mechanics is concerned with the correlation of what may be called lump effects, such as the relationship between the size of a beam and the load it can carry, the size of a ¿y wheel and the work it can do when stopped, the thickness and diameter of a boiler shell and the pressure it can stand, the size of a submerged body and the buoyant force which acts upon it, the size and shape of the air column in an organ pipe and its number of vibrations per second, the thickness of a glass plate and the electromotive force it can stand, the size of a copper wire and the current it can carry with a given rise of temperature and so forth.

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