This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
The use of corner beads is a matter of custom, being general in New England, and more rarely used in the West. In recent years the use of metal corner beads has become common, and these are to be preferred where a sharp corner is desired. Either a wooden or metal corner bead should be used, as it results in a saving of time to the plasterer, and being set and rigidly secured by the carpenter while furring the house, a plumb and square corner is assured. The superintendent should see that all beads are in one length, and that they are set plumb and square. Especial attention must be paid to arches, since the perfect shape of the arch is determined by the accuracy of the beads, and it will be difficult to remedy any defects after the plaster has been applied.