The City of Toledo's water supply is pumped by a single station known as the Broadway High Service Pumping Station, located on Broadway about 2' miles from the business center of the City. The present plant is situated on the site of the old original plant and is, comparatively speaking, an entirely new plant enveloping the original one. This operation was carried out by piecemeal construction over a period of five years, during which time no interruptions to service occurred. During the year 1920, serious consideration was given to the thought of securing maximum operating efficiency at this station, chiefly for two reasons: that operating costs had made a tremendous increase during and since the war, especially in fuel costs, and that the station was practically new both as to boilers and pumps and it was natural to conclude that increased efficiency must be possible. Accordingly, a general survey was made of the power-producing as well as the power-consuming units and their auxiliaries, from which conclusions were reached as to their relative economy of operation. For an accurate determination of many of the questions involved, meters of various types were necessary to uncover mi^ch of the information desired. A description of these and the results from their use are the purposes of this article.