[Electric engineering.] . 55. A number of regulators are in use in which the volt-age in the secondary is varied by changing its position withregard to the primary, instead of cutting turns in or having the secondary coil movable, it can be arrangedso that the amount of magnetic flux passing through it canbe varied, thus varying also the amount of the pressureadded to or subtracted from the line. In other regulators,both the primary and the secondary coils are fixed, and a S 17 ELECTRIC LIGHTING. 67 movable core arranged so that the magnetic flux passingthrough the secondary can be made
[Electric engineering.] . 55. A number of regulators are in use in which the volt-age in the secondary is varied by changing its position withregard to the primary, instead of cutting turns in or having the secondary coil movable, it can be arrangedso that the amount of magnetic flux passing through it canbe varied, thus varying also the amount of the pressureadded to or subtracted from the line. In other regulators,both the primary and the secondary coils are fixed, and a S 17 ELECTRIC LIGHTING. 67 movable core arranged so that the magnetic flux passingthrough the secondary can be made to vary. Both thesemethods afford a means of obtaining regulation by more. Fig. 66. gradual steps than can be obtained with the Stillwell regu-lator. Potential regulators are usually placed at somepoint convenient to the switchboard, and in some cases theoperating handles are mounted on the board itself and aregeared, by chains and sprocket wheels, to the regulator. 68 ELECTRIC LIGHTING. § 17 USE OF STORAGE BATTERIES IN LIGHTINGPLANTS. 56. Within the last 8 or 10 years, the use of storagebatteries in connection with lighting plants has steadilyincreased, for the advantages to be gained from its use areso great that many of the largest stations in the countryare now equipped with them. The load on all lightingplants is a variable one. During the day the load may bevery light, while for a few hours in the evening it may runup to a large amount. As this period of maximum load isgenerally of not more than 2 or 3 hours duration, it is evi-dent that if no means of storing electrical energy were pro-vided, the plant would have to be equipped so as to handlethis ma
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