Excerpt from Electrical Measurements and Meter Testing The difference between the readings Of the two gauges connected before and after the water motor represents the pressure required to overcome the Oppo sitiou Offered by the circuit through the motor and the pressure required to cause the revolving portion to turn. If there is no load on the motor, very little pressure will be required to operate it; but with an increase in load, there must be an increase in pressure acting on the motor if the speed is to be maintained constant. The action Of the water motor in this case corresponds to the constant-current series motor in the electrical circuit. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.