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| Figure 2-3 Eddy currents in core. |

| transformer, the windings surround the laminated steel core. In the shell-type transformer, the steel core surrounds the windings. The choice depends on the economics, both as to labor and material, involved in construction and installation. Small transformers used for power distribution are usually of the core type (Fig. 2-5), while some of the larger station or plant-power transformers are the shell type (Fig. 2-6 on page 26). |

| The insulated laminations which make up the core may be only several thousandths of an inch in thickness and may consist of various shapes: I, U, E, |

| Figure 2-4 Transformer core types. |

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