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The Levi Heywood Memorial Library Building stands amid a cluster of civic and religious buildings in the historic civic center of Gardner, located east of its commercial downtown on the south side of Pearl Street. It is a 1-1/2 story masonry structure, built out of red brick with brownstone and terra cotta trim, and covered by a slate roof.
A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]
For example, balanced two-phase power can be obtained from a three-phase network by using two specially constructed transformers, with taps at 50% and 86.6% of the primary voltage. This Scott T connection produces a true two-phase system with 90° time difference between the phases.
Gardner is the birthplace of the Heywood-Wakefield Company, dating from 1826 when the five Heywood brothers, Walter, Levi, Seth, Benjamin, and William, began to fashion wooden chairs and furniture in a barn near their family farm. In the early years, Walter fashioned chairs by hand, also using a foot lathe.
One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.
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A triple phase boundary (TPB) is a geometrical class of phase boundary and the location of contact between three different phases.A simple example of a TPB is a coastline where land, air and sea meet to create an energetic location driven by solar, wind and wave energy capable of supporting a high level of biodiversity.
Fig. 3: A Kelvin water dropper set up at the 2014 Cambridge Science Festival. If the buckets are metal conductors, then the built-up charge resides on the outside of the metal, not in the water. This is part of the electrical induction process, and is an example of the related "Faraday's ice bucket".