Page:Incandescent electric lighting- A practical description of the Edison system.djvu/99

 First—Recognition of the importance of safety and stability in operation.

Second—Obtaining the true economy of output under all conditions.

Third—Installing of plant in a build* dug entirely suited to the working of the same, and as far as human ingenuity can provide, proof against destruction.

Fourth—Adaptability to proper and economical working of the plant.

Fifth—Division of the generating power into the proper number of units for the safe and reliable operation of the plant.

Sixth—Flexibility of system; that is, adaptation to furnishing current for light, power and other sources of revenue, the obtaining of the largest return per dollar invested, and not carrying to excess for the mere sake of engineering in any part of the plant but the obtaining of proper results therefrom.

Seventh.—Not installing the plant for mushroom growth, but laying it out for comprehensive business, thereby securing