The advantages of overhead linework as compared with underground linework are that it is much less expensive; it is more readily and more quickly installed; and it can be more readily inspected and repaired.

Its principal disadvantages are that it is not so permanent as underground linework; it is more easily deranged; and it is more unsightly.

For large cities, and in congested districts, overhead linework should not be used. However, the question of first cost, the question of permanence, and the municipal regulations, are usually the factors which determine whether overhead or underground linework shall be used.

Fig. 59. Porcelain Cut Outs in Wooden Box. Courtesy of H. T. Paiste Co., Philadelphia, Pa.

Fig. 59. Porcelain Cut-Outs in Wooden Box. Courtesy of H. T. Paiste Co., Philadelphia, Pa.

The principal factors to be considered in overhead linework will be briefly outlined.