larity. This is effected by reversing the terminal con- tributed in three groups each of five machines placed an ampere is the maximum current that the protector nections-of the fifth machine. This necessarily causes in series for the regular work, while for local and spe- will carry. this machine… … 45 volts difference of potential are provided. These back of the switch board is shown in perspective with are supplied by the current from the fifth one, and as the bank of lamps appearing above the disks. An in- dynamos replace all batteries. At present there is not this current is reversed, the…
Internet Archive · Public domain (published before 1931). Free to use for anything.
